An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

National Air Toxics Assessment

Noncancer Risks Map of New England

The following map represents a summation of hazard quotients that are used to provide a quantification of risks associated with noncarcinogenic chronic health effects for respiratory irritants in New England. EPA considered adverse health effects other than cancer for 112 air toxics. A hazard quotient for a pollutant that is less than one indicates that no adverse health effects are expected as a result of exposure. If the hazard quotient is greater than one, then adverse health effects are possible. The hazard index represented in the following map is a sum of all of the hazard quotients for the respiratory target organ system, with 43 air toxics evaluated as respiratory irritants. The risk estimates in the map are based on the census tract level average of a typical individual's exposure.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.