State governments (as well as certain tribal and local governments) operate ambient air monitoring networks that support air quality management in the United States. U.S. EPA develops requirements for various aspects of these networks. Title 40, Protection of the Environment, in the Code of Federal Regulations (CFR) contains regulations established by U.S. EPA for air quality monitoring, including:
- 40 CFR Part 50 – Primary and Secondary National Ambient Air Quality Standards (NAAQS)
- 40 CFR Part 53 – Alternate equivalent air monitoring methods and procedures for obtaining equivalency
- 40 CFR Part 58 – Monitoring methodology, network design and siting, prevention of significant deterioration requirements, and quality assurance criteria
IDEM follows U.S. EPA guidance, conducts an annual review of Indiana’s ambient air monitoring network plan, and adheres to established quality assurance procedures to ensure Indiana complies with applicable federal ambient air monitoring requirements. U.S. EPA’s Ambient Monitoring Technology Information Center (AMTIC) contains detailed technical information concerning ambient air monitoring regulations.