Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

This is not the current EPA website. To navigate to the current EPA website, please go to www.epa.gov. This website is historical material reflecting the EPA website as it existed on January 19, 2025. This website is no longer updated and links to external websites and some internal pages may not work. More information »

JavaScript appears to be disabled on this computer. Please click here to see any active alerts.

Data Resources for Mobile Source Pollution

Following are data resources for mobile source pollution.

Air Emissions Inventories
Provides resources for emissions data, regulations, tools, and guidance.
Air Toxics Monitoring Program
The goal of the air toxics monitoring program is to support reduction of public exposure to hazardous air pollutants (HAPs).
Community Scale Air Toxics Ambient Monitoring (CSATAM) Projects
These projects are designed to assist state, local and tribal communities in identifying and profiling air toxics sources, characterizing the degree and extent of local air toxics problems, and tracking progress of air toxics reduction activities.
National Air Toxics Trends Stations (NATTS)
NATTS was developed to provide long-term monitoring data for HAPs with consistent quality.