My Local Exhaust Ventilation System isn’t Working
In this expert guide the air quality team at WTS consider some of the common problems associated with the selection and operation of Local Exhaust Ventilation systems.
Posts
What Gases Cause Indoor Air Pollution & How To Prevent It?
It’s not news that gases polluting the air we breathe, even in minute quantities, can have a huge effect on the health and wellbeing of building occupants. Worryingly, many of the most dangerous gases found inside buildings have no smell or colour, and so often the first indication that there might be a problem with indoor air pollution is staff members complaining of headaches, nausea or a general feeling of being unwell.
Dust Monitoring & Workplace Testing
There are any number of reasons why dust in the air could become a problem in your home or workplace. Sometimes dust can be a temporary issue caused by building work or external environmental conditions like a strong wind blowing sand, dust or pollen around more than usual. However, dust can become a real health issue in workplaces where the activities of the business itself result in high levels of dust and fine airborne particles (particulates) being created. This type of air pollution can lead to a significant decrease in air quality, and prolonged exposure can lead to conditions including coughs, wheeziness and headaches. Dealing with dust is usually straightforward, but first you need to identify whether or not you have a problem and this is where dust monitoring and indoor environmental testing come in to play.
Local Exhaust Ventilation (LEV) Systems – Examples of Good System Design
The following video looks at an example of a well-designed local exhaust ventilation (LEV) system in a school that controls well, is easy to operate and maintain and has low running costs. It looks at the use of an Atex compliant centralised vacuum extraction system used in a schools woodworking classroom and the benefits it can deliver.
Improving Dust Extraction & Control in Woodworking Environments
The following safety video looks at ways of improving dust extraction and control in woodworking environments, and in particular how to improve dust control measures at circular saw benches. It looks at ways to control the risks to workers health from exposure to wood dust, dust extraction systems and how those risks can be controlled to create a better, safer working environment.
What is Local Exhaust Ventilation or LEV?
The following presentation asks the question what is Local Exhaust Ventilation or LEV? It examines the health and safety measures used to control dust and fumes in the workplace using local exhaust ventilation systems (LEV) also called dust extraction or fume control.
Local Exhaust Ventilation
LEV Testing & Local Exhaust Ventilation Inspections
Expert LEV testing and inspection solutions.
WTS is a leading independent UK environmental services company offering a range of specialist Local Exhaust Ventilation inspection services including LEV testing, risk assessments, ventilation system surveys and indoor air quality assessments to meet COSHH and Health & Safety Executive HSG258 standards.
Our LEV inspection services are delivered by fully trained, in-field experts who combine the latest high performance testing and analysis equipment and laboratory analysis techniques to help reduce exposure to harmful dust, mist, fumes, gas and other airborne contaminants in the workplace environment.
Expert LEV testing & local exhaust ventilation inspections
Our expert LEV inspection and monitoring solutions include:
Full national UK coverage
With offices in London serving the South and South East England, Manchester (North West), Birmingham (Midlands), Bristol (South East England and Wales), Leeds (North and North East) and Glasgow (Scotland), supported by regional teams of specially trained engineers, in-field specialists and technical experts we can offer exhaust ventilation testing and assessment solutions throughout the UK.
Contact WTS today to learn how our expert air safety solutions can help safeguard your business and protect the safety and health of your employees. To speak with one of our Local Exhaust Ventilation experts call us on 0330 223 31 31 or simply use this button.
The dangers of airborne contaminants in the workplace
Every year thousands of people across the UK die as a result of breathing in harmful dust and fumes at work.
Common conditions include asthma, lung scarring and cancer.
A common way businesses can reduce these risks is to control such airborne contaminants by using a properly designed, maintained and operated local exhaust ventilation system.
What is Local Exhaust Ventilation or LEV?
Local Exhaust Ventilation or LEV describes a special mechanical ventilation system used in the workplace that is designed to carefully remove harmful dust, mist, fumes, gas and other airborne contaminants from the air to reduce exposure and protect the health and safety of workers.
What is the law covering LEV?
In the UK it is the employers’ responsibility to ensure that employee exposure to airborne contaminants in the workplace is reduced to levels as low as is reasonably practicable.
The employers’ legal responsibilities are dealt with under the Health and Safety at Work etc. Act 1974, the Control of Substances Hazardous to Health Regulations (COSHH) 2002 (as amended) and the Management of Health and Safety at Work Regulations 1999 (MHSWR).
The Health & Safety Executive also publish a comprehensive guidance document HSG258 “Controlling airborne contaminants at work, A guide to local exhaust ventilation (LEV)”.
HSG258 provides guidance for employers and their employees, LEV designers, installers and examiners and describes the principles and good practice of selecting, designing, commissioning and testing LEV systems.
- Download a full copy of the latest HSG258 here… HSG258 →
How often do I need Local Exhaust Ventilation testing?
Under the COSHH Regulations employers who use Local Exhaust Ventilation systems to control hazardous substances, must ensure that the system is operating effectively.
To do this the employer should carry out regular and detailed inspections and testing of the system.
The maximum time between tests of most LEV systems is 14 months although some higher risk systems will require more frequent testing.
However, if wear and tear has reduced the effectiveness of the system then the test and inspection frequency should be increased.
It is also a recommendation of the HSE that regular reviews of the systems of work be carried out.
What does LEV testing involve?
Our LEV examination and testing procedures are performed by suitably competent assessors using the latest high performance analysis equipment including Pitot tubes, smoke generators, dust lamps, anemometers and air sampling equipment.
We also offer a comprehensive range of laboratory testing and analysis services to support our specialist in-field operations.
Our detailed LEV testing assessments follow the requirements identified by the HSE in HSG258 and comprise three distinct stages as follows:
Expert LEV testing, Local Exhaust Ventilation tests & inspections
Contact WTS today to find out more about our expert LEV testing and inspection solutions and how we can help improve workplace health, safety and compliance issues.
With offices in London serving the South and South East England, Manchester (North West), Birmingham (Midlands), Bristol (South East England and Wales), Leeds (North and North East) and Glasgow (Scotland), supported by regional teams of specially trained engineers, in-field LEV specialists and technical experts we can offer professional, cost effective Local Exhaust Ventilation testing and inspection support solutions across the whole of the UK.
Contact us today for more information or for your FREE, no obligation quote.
You may also be interested in…
Further reading…
Learn more about indoor air quality testing and investigations … here →
REVIEWS
Submit your review here
My Local Exhaust Ventilation System isn’t Working
In this expert guide the air quality team at WTS consider some of the common problems associated with the selection and operation of Local Exhaust Ventilation systems.
What Gases Cause Indoor Air Pollution & How To Prevent It?
It’s not news that gases polluting the air we breathe, even in minute quantities, can have a huge effect on the health and wellbeing of building occupants. Worryingly, many of the most dangerous gases found inside buildings have no smell or colour, and so often the first indication that there might be a problem with indoor air pollution is staff members complaining of headaches, nausea or a general feeling of being unwell.
Dust Monitoring & Workplace Testing
There are any number of reasons why dust in the air could become a problem in your home or workplace. Sometimes dust can be a temporary issue caused by building work or external environmental conditions like a strong wind blowing sand, dust or pollen around more than usual. However, dust can become a real health issue in workplaces where the activities of the business itself result in high levels of dust and fine airborne particles (particulates) being created. This type of air pollution can lead to a significant decrease in air quality, and prolonged exposure can lead to conditions including coughs, wheeziness and headaches. Dealing with dust is usually straightforward, but first you need to identify whether or not you have a problem and this is where dust monitoring and indoor environmental testing come in to play.
Local Exhaust Ventilation (LEV) Systems – Examples of Good System Design
The following video looks at an example of a well-designed local exhaust ventilation (LEV) system in a school that controls well, is easy to operate and maintain and has low running costs. It looks at the use of an Atex compliant centralised vacuum extraction system used in a schools woodworking classroom and the benefits it can deliver.
Improving Dust Extraction & Control in Woodworking Environments
The following safety video looks at ways of improving dust extraction and control in woodworking environments, and in particular how to improve dust control measures at circular saw benches. It looks at ways to control the risks to workers health from exposure to wood dust, dust extraction systems and how those risks can be controlled to create a better, safer working environment.
What is Local Exhaust Ventilation or LEV?
The following presentation asks the question what is Local Exhaust Ventilation or LEV? It examines the health and safety measures used to control dust and fumes in the workplace using local exhaust ventilation systems (LEV) also called dust extraction or fume control.
Local Exhaust Ventilation
LEV Testing & Local Exhaust Ventilation Inspections
Expert LEV testing and inspection solutions.
WTS is a leading independent UK environmental services company offering a range of specialist Local Exhaust Ventilation inspection services including LEV testing, risk assessments, ventilation system surveys and indoor air quality assessments to meet COSHH and Health & Safety Executive HSG258 standards.
Our LEV inspection services are delivered by fully trained, in-field experts who combine the latest high performance testing and analysis equipment and laboratory analysis techniques to help reduce exposure to harmful dust, mist, fumes, gas and other airborne contaminants in the workplace environment.
Expert LEV testing & local exhaust ventilation inspections
Our expert LEV inspection and monitoring solutions include:
Full national UK coverage
With offices in London serving the South and South East England, Manchester (North West), Birmingham (Midlands), Bristol (South East England and Wales), Leeds (North and North East) and Glasgow (Scotland), supported by regional teams of specially trained engineers, in-field specialists and technical experts we can offer exhaust ventilation testing and assessment solutions throughout the UK.
Contact WTS today to learn how our expert air safety solutions can help safeguard your business and protect the safety and health of your employees. To speak with one of our Local Exhaust Ventilation experts call us on 0330 223 31 31 or simply use this button.
The dangers of airborne contaminants in the workplace
Every year thousands of people across the UK die as a result of breathing in harmful dust and fumes at work.
Common conditions include asthma, lung scarring and cancer.
A common way businesses can reduce these risks is to control such airborne contaminants by using a properly designed, maintained and operated local exhaust ventilation system.
What is Local Exhaust Ventilation or LEV?
Local Exhaust Ventilation or LEV describes a special mechanical ventilation system used in the workplace that is designed to carefully remove harmful dust, mist, fumes, gas and other airborne contaminants from the air to reduce exposure and protect the health and safety of workers.
What is the law covering LEV?
In the UK it is the employers’ responsibility to ensure that employee exposure to airborne contaminants in the workplace is reduced to levels as low as is reasonably practicable.
The employers’ legal responsibilities are dealt with under the Health and Safety at Work etc. Act 1974, the Control of Substances Hazardous to Health Regulations (COSHH) 2002 (as amended) and the Management of Health and Safety at Work Regulations 1999 (MHSWR).
The Health & Safety Executive also publish a comprehensive guidance document HSG258 “Controlling airborne contaminants at work, A guide to local exhaust ventilation (LEV)”.
HSG258 provides guidance for employers and their employees, LEV designers, installers and examiners and describes the principles and good practice of selecting, designing, commissioning and testing LEV systems.
- Download a full copy of the latest HSG258 here… HSG258 →
How often do I need Local Exhaust Ventilation testing?
Under the COSHH Regulations employers who use Local Exhaust Ventilation systems to control hazardous substances, must ensure that the system is operating effectively.
To do this the employer should carry out regular and detailed inspections and testing of the system.
The maximum time between tests of most LEV systems is 14 months although some higher risk systems will require more frequent testing.
However, if wear and tear has reduced the effectiveness of the system then the test and inspection frequency should be increased.
It is also a recommendation of the HSE that regular reviews of the systems of work be carried out.
What does LEV testing involve?
Our LEV examination and testing procedures are performed by suitably competent assessors using the latest high performance analysis equipment including Pitot tubes, smoke generators, dust lamps, anemometers and air sampling equipment.
We also offer a comprehensive range of laboratory testing and analysis services to support our specialist in-field operations.
Our detailed LEV testing assessments follow the requirements identified by the HSE in HSG258 and comprise three distinct stages as follows:
Expert LEV testing, Local Exhaust Ventilation tests & inspections
Contact WTS today to find out more about our expert LEV testing and inspection solutions and how we can help improve workplace health, safety and compliance issues.
With offices in London serving the South and South East England, Manchester (North West), Birmingham (Midlands), Bristol (South East England and Wales), Leeds (North and North East) and Glasgow (Scotland), supported by regional teams of specially trained engineers, in-field LEV specialists and technical experts we can offer professional, cost effective Local Exhaust Ventilation testing and inspection support solutions across the whole of the UK.
Contact us today for more information or for your FREE, no obligation quote.
You may also be interested in…
Further reading…
Learn more about indoor air quality testing and investigations … here →
REVIEWS
Submit your review here
Pages
My Local Exhaust Ventilation System isn’t Working
In this expert guide the air quality team at WTS consider some of the common problems associated with the selection and operation of Local Exhaust Ventilation systems.
What Gases Cause Indoor Air Pollution & How To Prevent It?
It’s not news that gases polluting the air we breathe, even in minute quantities, can have a huge effect on the health and wellbeing of building occupants. Worryingly, many of the most dangerous gases found inside buildings have no smell or colour, and so often the first indication that there might be a problem with indoor air pollution is staff members complaining of headaches, nausea or a general feeling of being unwell.
Dust Monitoring & Workplace Testing
There are any number of reasons why dust in the air could become a problem in your home or workplace. Sometimes dust can be a temporary issue caused by building work or external environmental conditions like a strong wind blowing sand, dust or pollen around more than usual. However, dust can become a real health issue in workplaces where the activities of the business itself result in high levels of dust and fine airborne particles (particulates) being created. This type of air pollution can lead to a significant decrease in air quality, and prolonged exposure can lead to conditions including coughs, wheeziness and headaches. Dealing with dust is usually straightforward, but first you need to identify whether or not you have a problem and this is where dust monitoring and indoor environmental testing come in to play.
Local Exhaust Ventilation (LEV) Systems – Examples of Good System Design
The following video looks at an example of a well-designed local exhaust ventilation (LEV) system in a school that controls well, is easy to operate and maintain and has low running costs. It looks at the use of an Atex compliant centralised vacuum extraction system used in a schools woodworking classroom and the benefits it can deliver.
Improving Dust Extraction & Control in Woodworking Environments
The following safety video looks at ways of improving dust extraction and control in woodworking environments, and in particular how to improve dust control measures at circular saw benches. It looks at ways to control the risks to workers health from exposure to wood dust, dust extraction systems and how those risks can be controlled to create a better, safer working environment.
What is Local Exhaust Ventilation or LEV?
The following presentation asks the question what is Local Exhaust Ventilation or LEV? It examines the health and safety measures used to control dust and fumes in the workplace using local exhaust ventilation systems (LEV) also called dust extraction or fume control.
Local Exhaust Ventilation
LEV Testing & Local Exhaust Ventilation Inspections
Expert LEV testing and inspection solutions.
WTS is a leading independent UK environmental services company offering a range of specialist Local Exhaust Ventilation inspection services including LEV testing, risk assessments, ventilation system surveys and indoor air quality assessments to meet COSHH and Health & Safety Executive HSG258 standards.
Our LEV inspection services are delivered by fully trained, in-field experts who combine the latest high performance testing and analysis equipment and laboratory analysis techniques to help reduce exposure to harmful dust, mist, fumes, gas and other airborne contaminants in the workplace environment.
Expert LEV testing & local exhaust ventilation inspections
Our expert LEV inspection and monitoring solutions include:
Full national UK coverage
With offices in London serving the South and South East England, Manchester (North West), Birmingham (Midlands), Bristol (South East England and Wales), Leeds (North and North East) and Glasgow (Scotland), supported by regional teams of specially trained engineers, in-field specialists and technical experts we can offer exhaust ventilation testing and assessment solutions throughout the UK.
Contact WTS today to learn how our expert air safety solutions can help safeguard your business and protect the safety and health of your employees. To speak with one of our Local Exhaust Ventilation experts call us on 0330 223 31 31 or simply use this button.
The dangers of airborne contaminants in the workplace
Every year thousands of people across the UK die as a result of breathing in harmful dust and fumes at work.
Common conditions include asthma, lung scarring and cancer.
A common way businesses can reduce these risks is to control such airborne contaminants by using a properly designed, maintained and operated local exhaust ventilation system.
What is Local Exhaust Ventilation or LEV?
Local Exhaust Ventilation or LEV describes a special mechanical ventilation system used in the workplace that is designed to carefully remove harmful dust, mist, fumes, gas and other airborne contaminants from the air to reduce exposure and protect the health and safety of workers.
What is the law covering LEV?
In the UK it is the employers’ responsibility to ensure that employee exposure to airborne contaminants in the workplace is reduced to levels as low as is reasonably practicable.
The employers’ legal responsibilities are dealt with under the Health and Safety at Work etc. Act 1974, the Control of Substances Hazardous to Health Regulations (COSHH) 2002 (as amended) and the Management of Health and Safety at Work Regulations 1999 (MHSWR).
The Health & Safety Executive also publish a comprehensive guidance document HSG258 “Controlling airborne contaminants at work, A guide to local exhaust ventilation (LEV)”.
HSG258 provides guidance for employers and their employees, LEV designers, installers and examiners and describes the principles and good practice of selecting, designing, commissioning and testing LEV systems.
- Download a full copy of the latest HSG258 here… HSG258 →
How often do I need Local Exhaust Ventilation testing?
Under the COSHH Regulations employers who use Local Exhaust Ventilation systems to control hazardous substances, must ensure that the system is operating effectively.
To do this the employer should carry out regular and detailed inspections and testing of the system.
The maximum time between tests of most LEV systems is 14 months although some higher risk systems will require more frequent testing.
However, if wear and tear has reduced the effectiveness of the system then the test and inspection frequency should be increased.
It is also a recommendation of the HSE that regular reviews of the systems of work be carried out.
What does LEV testing involve?
Our LEV examination and testing procedures are performed by suitably competent assessors using the latest high performance analysis equipment including Pitot tubes, smoke generators, dust lamps, anemometers and air sampling equipment.
We also offer a comprehensive range of laboratory testing and analysis services to support our specialist in-field operations.
Our detailed LEV testing assessments follow the requirements identified by the HSE in HSG258 and comprise three distinct stages as follows:
Expert LEV testing, Local Exhaust Ventilation tests & inspections
Contact WTS today to find out more about our expert LEV testing and inspection solutions and how we can help improve workplace health, safety and compliance issues.
With offices in London serving the South and South East England, Manchester (North West), Birmingham (Midlands), Bristol (South East England and Wales), Leeds (North and North East) and Glasgow (Scotland), supported by regional teams of specially trained engineers, in-field LEV specialists and technical experts we can offer professional, cost effective Local Exhaust Ventilation testing and inspection support solutions across the whole of the UK.
Contact us today for more information or for your FREE, no obligation quote.
You may also be interested in…
Further reading…
Learn more about indoor air quality testing and investigations … here →
REVIEWS
Submit your review here
My Local Exhaust Ventilation System isn’t Working
In this expert guide the air quality team at WTS consider some of the common problems associated with the selection and operation of Local Exhaust Ventilation systems.
What Gases Cause Indoor Air Pollution & How To Prevent It?
It’s not news that gases polluting the air we breathe, even in minute quantities, can have a huge effect on the health and wellbeing of building occupants. Worryingly, many of the most dangerous gases found inside buildings have no smell or colour, and so often the first indication that there might be a problem with indoor air pollution is staff members complaining of headaches, nausea or a general feeling of being unwell.
Dust Monitoring & Workplace Testing
There are any number of reasons why dust in the air could become a problem in your home or workplace. Sometimes dust can be a temporary issue caused by building work or external environmental conditions like a strong wind blowing sand, dust or pollen around more than usual. However, dust can become a real health issue in workplaces where the activities of the business itself result in high levels of dust and fine airborne particles (particulates) being created. This type of air pollution can lead to a significant decrease in air quality, and prolonged exposure can lead to conditions including coughs, wheeziness and headaches. Dealing with dust is usually straightforward, but first you need to identify whether or not you have a problem and this is where dust monitoring and indoor environmental testing come in to play.
Local Exhaust Ventilation (LEV) Systems – Examples of Good System Design
The following video looks at an example of a well-designed local exhaust ventilation (LEV) system in a school that controls well, is easy to operate and maintain and has low running costs. It looks at the use of an Atex compliant centralised vacuum extraction system used in a schools woodworking classroom and the benefits it can deliver.
Improving Dust Extraction & Control in Woodworking Environments
The following safety video looks at ways of improving dust extraction and control in woodworking environments, and in particular how to improve dust control measures at circular saw benches. It looks at ways to control the risks to workers health from exposure to wood dust, dust extraction systems and how those risks can be controlled to create a better, safer working environment.
What is Local Exhaust Ventilation or LEV?
The following presentation asks the question what is Local Exhaust Ventilation or LEV? It examines the health and safety measures used to control dust and fumes in the workplace using local exhaust ventilation systems (LEV) also called dust extraction or fume control.
Local Exhaust Ventilation
LEV Testing & Local Exhaust Ventilation Inspections
Expert LEV testing and inspection solutions.
WTS is a leading independent UK environmental services company offering a range of specialist Local Exhaust Ventilation inspection services including LEV testing, risk assessments, ventilation system surveys and indoor air quality assessments to meet COSHH and Health & Safety Executive HSG258 standards.
Our LEV inspection services are delivered by fully trained, in-field experts who combine the latest high performance testing and analysis equipment and laboratory analysis techniques to help reduce exposure to harmful dust, mist, fumes, gas and other airborne contaminants in the workplace environment.
Expert LEV testing & local exhaust ventilation inspections
Our expert LEV inspection and monitoring solutions include:
Full national UK coverage
With offices in London serving the South and South East England, Manchester (North West), Birmingham (Midlands), Bristol (South East England and Wales), Leeds (North and North East) and Glasgow (Scotland), supported by regional teams of specially trained engineers, in-field specialists and technical experts we can offer exhaust ventilation testing and assessment solutions throughout the UK.
Contact WTS today to learn how our expert air safety solutions can help safeguard your business and protect the safety and health of your employees. To speak with one of our Local Exhaust Ventilation experts call us on 0330 223 31 31 or simply use this button.
The dangers of airborne contaminants in the workplace
Every year thousands of people across the UK die as a result of breathing in harmful dust and fumes at work.
Common conditions include asthma, lung scarring and cancer.
A common way businesses can reduce these risks is to control such airborne contaminants by using a properly designed, maintained and operated local exhaust ventilation system.
What is Local Exhaust Ventilation or LEV?
Local Exhaust Ventilation or LEV describes a special mechanical ventilation system used in the workplace that is designed to carefully remove harmful dust, mist, fumes, gas and other airborne contaminants from the air to reduce exposure and protect the health and safety of workers.
What is the law covering LEV?
In the UK it is the employers’ responsibility to ensure that employee exposure to airborne contaminants in the workplace is reduced to levels as low as is reasonably practicable.
The employers’ legal responsibilities are dealt with under the Health and Safety at Work etc. Act 1974, the Control of Substances Hazardous to Health Regulations (COSHH) 2002 (as amended) and the Management of Health and Safety at Work Regulations 1999 (MHSWR).
The Health & Safety Executive also publish a comprehensive guidance document HSG258 “Controlling airborne contaminants at work, A guide to local exhaust ventilation (LEV)”.
HSG258 provides guidance for employers and their employees, LEV designers, installers and examiners and describes the principles and good practice of selecting, designing, commissioning and testing LEV systems.
- Download a full copy of the latest HSG258 here… HSG258 →
How often do I need Local Exhaust Ventilation testing?
Under the COSHH Regulations employers who use Local Exhaust Ventilation systems to control hazardous substances, must ensure that the system is operating effectively.
To do this the employer should carry out regular and detailed inspections and testing of the system.
The maximum time between tests of most LEV systems is 14 months although some higher risk systems will require more frequent testing.
However, if wear and tear has reduced the effectiveness of the system then the test and inspection frequency should be increased.
It is also a recommendation of the HSE that regular reviews of the systems of work be carried out.
What does LEV testing involve?
Our LEV examination and testing procedures are performed by suitably competent assessors using the latest high performance analysis equipment including Pitot tubes, smoke generators, dust lamps, anemometers and air sampling equipment.
We also offer a comprehensive range of laboratory testing and analysis services to support our specialist in-field operations.
Our detailed LEV testing assessments follow the requirements identified by the HSE in HSG258 and comprise three distinct stages as follows:
Expert LEV testing, Local Exhaust Ventilation tests & inspections
Contact WTS today to find out more about our expert LEV testing and inspection solutions and how we can help improve workplace health, safety and compliance issues.
With offices in London serving the South and South East England, Manchester (North West), Birmingham (Midlands), Bristol (South East England and Wales), Leeds (North and North East) and Glasgow (Scotland), supported by regional teams of specially trained engineers, in-field LEV specialists and technical experts we can offer professional, cost effective Local Exhaust Ventilation testing and inspection support solutions across the whole of the UK.
Contact us today for more information or for your FREE, no obligation quote.
You may also be interested in…
Further reading…
Learn more about indoor air quality testing and investigations … here →