Emissions Inventory Program

The Emissions Inventory Program is responsible for compiling data on the release of air pollutants. The Emissions Inventory Program uses a variety of data sources and statistical modeling to calculate emissions from stationary sources (factories and homes), mobile sources (cars, trains, etc.), and biogenic sources (vegetation and soils). The periodic compilation of the air pollutant emissions data is called an inventory. For data compilation purposes, air pollutants are divided into three broad categories: criteria pollutants, hazardous air pollutants (also known as air toxics), and greenhouse gases. This section is designed both to assist facilities in Maine with the collection and submission of air pollutant emission data and to disseminate information to the public about what those emissions mean for their health and the environment. For more information contact: Stacy Knapp 207-766-1928

Emissions Inventory Information

Annual Air Emissions Inventory Reporting is required for nearly 200 licensed facilities in Maine. This page explains the requirements in a Q&A format.

CAERS is a free web based reporting system developed by EPA to assist facilities with their annual air emissions reporting requirements. Log in to CAERS

Air Emissions Inventory Data - Maine DEP provides summaries of criteria air pollutant and greenhouse gas emissions inventories, as well as other inventory products, through its FTP site. Please view the readme.txt file for a full description of available information.

Greenhouse Gas Goals and Biennial Report - Maine DEP tracks Maine’s progress toward meeting the statutory greenhouse gas reduction goals through biennial reports to the Legislature.

Vehicle Emissions and Greenhouse Gas Data - download data files for vehicle populations, vehicle miles traveled, fuel consumption and more.