Lone Star Screen
REBUILT EPA retired and archived COBRA in 2025. This recreates its core calculation — emissions change → source-receptor air quality change → health impact — using the same public source-receptor matrix, scoped to Texas as the receptor state. Not an official EPA tool.

Lone Star Screen

Specify an emissions change anywhere in the U.S. and see the estimated PM2.5 and ozone health impact across every Texas county — computed live from EPA's source-receptor matrix, no server required. Sources within Texas use full county-to-county precision; sources in other states use a population-weighted state-level average.

Emissions Scenario

Source location
Source county
Pollutant emitted

Emission point type
Emissions change (tons/year)

Negative = reduction (a benefit scenario). Positive = increase. Short tons/year, matching the matrix's calibration.

Statewide mortality change —
Monetized value —
Adjust inputs above to see results.
harm
benefit

Most-affected counties