Air Monitoring and Reporting

The Department of Environmental Protection 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 that is used in the evaluation of the air pollutant data. Data may also be collected over a twenty-four hour period such as particulates or it may be collected as a composite over an entire week. Examples of the latter are 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. For more information, contact Andy Johnson (207) 287-7047 or Rick Marriner (207) 215-7309.

Air Monitoring Data Service including:

Emissions Inventory

  • MAIRIS is a free web based reporting system developed by the Maine Department of Environmental Protection to assist Maine facilities with their annual air emissions reporting requirements.

Annual Air Monitoring Plan 2015 (pdf) - The Maine Department of Environmental Protection (ME DEP) operates a network of air monitoring sites at locations across the state. ME DEP is required to submit an Annual Ambient Air Quality Monitoring Network Plan to the U.S. Environmental Protection Agency (EPA). This document and its attachments are subject to a 30-day public comment period before ME DEP submits them to EPA for review and approval. The 2015 Annual Air Monitoring Plan was posted on May 31, 2014; comment period ended and the plan was submitted to EPA on July 1, 2014. EPA gave final approval on August 7, 2014.

The annual network plan describes to EPA which pollutants and other parameters ME DEP measures at its various ambient air monitoring sites and why they are measured at those specific locations. It also describes changes in the network - including new and closed locations, and new and discontinued measurements at existing locations - since the last network plan, as well as proposed changes in the network over the next 12 months.