The Massachusetts Department of Environmental Protection (MassDEP) is the state agency responsible for monitoring outdoor air quality in Massachusetts. The MassDEP Air Assessment Branch (AAB) operates an extensive network of 28 monitoring stations in 20 cities and towns across the state. See the map below for their locations.

Why Do We Monitor the Air?

Massachusetts monitors and reports on ambient air quality across the state as part of a comprehensive program to:

  • Provide information about air quality to the public;
  • Provide short-term and long-term information regarding air pollution and public health;
  • Verify compliance with National Ambient Air Quality Standards;
  • Assess the effectiveness of current air pollution control regulations and initiatives;
  • Support development of policies and regulations aimed at reducing air pollution;
  • Support long-term trend analysis and special research; and
  • Fulfill requirements to report ambient air quality data to the U.S. Environmental Protection Agency (EPA)