We've made some changes to EPA.gov. If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

User’s Manual for the Co - Benefits Risk Assessment (COBRA) Screening Model

COBRA is a screening tool that provides preliminary estimates of the impact of air pollution emission changes on ambient particulate matter (PM) air pollution concentrations, translates this into health effect impacts, and then monetizes these impacts.

You may need Adobe Reader to view files on this page. See EPA’s About PDF page to learn more.