AirToxScreen: EPA Air Toxics Health Risk Estimates at National to Census Block Levels

The EPA Air Toxics Screening Assessment Tool (ATSA), also called AirToxScreen, provides annual screening-level estimates for cancer and other serious health effects from breathing outdoor pollutants over many years. It offers updated data and risk analyses at national, state, county, and census block levels, designed to guide further investigation into air toxics risks. The Environmental Protection Agency (EPA) produces this data, with the last update recorded on 2026-05 04 15:38:06.

Use Cases

• Identify geographic areas with elevated cancer risk based on the mapping tool and census block-level screening data.
• Analyze trends in air toxics emissions and associated health effects using the annual updated data.
• Prioritize locations for detailed environmental study based on screening-level risk assessments.
• Visualize national patterns of air pollution and health risk using the provided U.S. mapping tool.

Strengths

• Data is updated on an annual basis, providing a time series for analysis.
• Offers geographic granularity down to the census block level.
• Includes a mapping tool for visualizing cancer risks and emissions data across the United States.
• Produced by the authoritative Environmental Protection Agency (EPA).

Limitations

• Description metadata is limited; actual data quality requires manual inspection after download.
• Column-level documentation is absent; field semantics must be inferred after download.
• Row count and specific file formats are unknown, which may limit suitability assessment.

Provenance

Source

Environmental Protection Agency (EPA)

Collection Method

Screening-level risk assessment modeling of air toxics data.

Time Range

Annual assessments for specified years (exact years not stated).

Freshness

Last updated 2026-05-04 15:38:06; freshness should be verified.

Geography

United States, at national, state, county, and census block levels.