Welcome to the Bureau of Air Quality's Online Air Monitoring Data Service
The Bureau of Air Quality operates and maintains a variety of ambient
air monitoring equipment around the state. Some of these instruments
operate on a continuous basis and provide hourly averages of pollutants
or meteorological data used in the evaluation of air quality. Data may also be collected over a twenty-four hour
period for pollutants such as particulates or it may be collected as a composite sample over
an entire week. Examples of the latter can be found in the atmospheric and mercury
deposition monitoring programs. The number of monitoring sites and the
pollutants that are monitored may vary from year to year depending on
the expected concentrations of the pollutants, the origin of the
pollutants and new programs based on changes in existing regulations or
the establishment of new regulations.
Preliminary data from all of the Bureau's continuous monitors is
currently available at this site. Some historical data is also
available at this site. (What is Preliminary Data?)
Atmospheric Deposition (Acid Rain)
Field measurements from several sites operated in Maine are available at this site.
Air Quality Forecast
Information for the general public on current air quality
concentrations for ozone and particulates and expected air quality
concentrations for the upcoming 24 hours can be found at this site.