Hazardous Air Pollutants

Air Toxics Program
The Clean Air Act requires that states use the Title V Operating Permit System to administer the Air Toxics Program. Although the majority of Title V Operating Permits do not contain enforceable limits on specific hazardous air pollutants, most of the hazardous air pollutants are regulated as particulate or VOCs. The review report of the permit will usually contain rough estimates of other hazardous air emissions. These estimates in the review report are for information purposes only and are not specified as enforceable limits. As techniques for estimating hazardous air pollutant emissions improve, some of these estimates may increase while others decrease.

Sharply Reducing "Routine" Emissions
EPA has set standards requiring companies to sharply reduce "routine" emissions of hazardous air pollutants. EPA will do so by setting performance standards based on the best demonstrated controls and practices for each regulated industry, termed Maximum Achievable Control Technology (MACT). Should EPA miss an established deadline for setting a MACT standard, the states must issue these standards.

Particularly Hazardous Substances
EPA has also established a list of substances that are particularly hazardous when inadvertently released into the air by an unanticipated or uncontrolled event. Title V Operating Permit Applications require the business to indicate the range of the facility's annual usage of these chemicals. Facilities that use more than established quantities of these substances will be required to prepare risk management plans and comply with accidental release prevention regulations.