Employers on alert as workers face health risks due to poor air quality
Millions of people live and work in areas of the country where air pollution can cause serious health problems. Like the weather, air quality can change from day to day. As the EPA and its partners gear up for air quality awareness week, employers should be mindful of the health effects of the five most common air pollutants and how to protect their workforce.
What is air quality index?
More commonly known as AQI, the air quality index is a daily air quality report that characterizes air pollution levels and associated health effects that might be of concern to human health. It uses color-coded categories to inform the public about air quality in their area, which groups of individuals may be affected, and steps to take to reduce exposure to air pollution. It’s also used as the basis for air quality forecasts and current air quality reporting by www.airnow.gov, state and local public service agencies, and the local news media.
How can employers protect their workers?
When the AQI reaches unhealthy levels, employers must implement protective measures to reduce exposure to their workers. This can include:
- Monitoring of air quality conditions frequently;
- Relocating or rescheduling work tasks;
- Reducing levels of physical activity, especially strenuous and heavy work;
- Making accommodations for employees to work inside when possible; and
- Providing or allowing the use of NIOSH-approved respirators for voluntary use, when not otherwise required.
How is AQI measured?
AQI values range from 0 to 500; the higher the AQI value, the greater the level of air pollution and the greater the health concern. AQI values below 100 are generally thought of as satisfactory. When AQI values are above 100, air quality is considered to be unhealthy – at first for certain sensitive groups of people, then for everyone as AQI values get higher.
Daily AQI color | Levels of concern | Values of index | Description of air quality |
Green | Good | 0 to 50 | Air quality is satisfactory; air pollution poses little or no risk. |
Yellow | Moderate | 51 to 100 | Air quality is acceptable; there may be risk for some people. |
Orange | Unhealthy for sensitive groups | 101 to 150 | Members of sensitive groups may experience health effects; general public less likely to be affected. |
Red | Unhealthy | 151 to 200 | Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. |
Purple | Very unhealthy | 201 to 300 | The risk of health effects is increased for everyone. |
Maroon | Hazardous | 301 or higher | Everyone is more likely to be affected; health emergency. |
What criteria pollutants make up AQI?
Generally based on the health-based National Ambient Air Quality Standards (NAAQS), the EPA calculates the AQI for five criteria pollutants:
- Ozone (O3),
- Particulate matter (PM),
- Carbon monoxide (CO),
- Nitrogen dioxide (NO2), and
- Sulfur dioxide (SO2).
These pollutants can harm human health and the environment and cause property damage. Of the five pollutants, particulate matter and ground-level ozone are the most widespread health threats. The EPA calls these pollutants "criteria" air pollutants because it regulates them by developing limits based on human health and/or environmental criteria.
Key to remember: Health risks are prompting employers to safeguard workers against daily fluctuations and the dangers posed by five common air pollutants.