Air Quality & Monitoring

How relatively clean or polluted the air is in your part of Massachusetts at the moment, and what it might mean for your health.

MassDEP issues regional ozone (smog) forecasts between April and October and fine particle pollution forecasts year-round.

MassDEP's current health-based Allowable Ambient Limits (AALs) and Threshold Effects Exposure Limits (TELs), used to evaluate health risks from exposure to chemicals in the air.

What they are, where they come from, how they affect our health and the environment, and what state government is doing to address them.

Information is available for a variety of pollutants, sites and time periods.

In addition to harming our health, air pollution can cause a variety of environmental problems.

Learn about what causes localized particle pollution, which can be a year-round problem, and get a quick "snapshot" of current fine particle levels in rural, suburban and urban parts of the state.

Common air pollutants can affect sensitive populations including children, seniors and people with respiratory problems - and even active, healthy adults when pollution levels are high.

Learn about the MassDEP statewide ambient air quality monitoring network.

Learn about what causes ozone (smog) - particularly on warm, sunny days - and get a quick "snapshot" of current ozone levels in your part of Massachusetts.

Annual reports, state implementation plans, ambient air monitoring data and long-term emissions trends.

Learn about the sources of air pollution in your community.

Select from a variety of air pollutants, locations and time periods to develop custom graphs showing emission trends over time.