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A chemical and petroleum industrial corridor, that is a known source of ethylene oxide emissions, is seen from this aerial photo, in Ascension Parish, La., Friday, June 7, 2024. (AP Photo/Gerald Herbert)
A chemical and petroleum industrial corridor, that is a known source of ethylene oxide emissions, is seen along the Mississippi River from this aerial photo, in Ascension Parish, La., Friday, June 7, 2024. (AP Photo/Gerald Herbert)
A chemical and petroleum industrial corridor, that is a known source of ethylene oxide emissions, is seen along the Mississippi River from this aerial photo, in Ascension Parish, La., Friday, June 7, 2024. (AP Photo/Gerald Herbert)
The community of Geismar is seen in the shadow of a chemical and petroleum industrial corridor, that is a known source of ethylene oxide emissions, in Ascension Parish, La., Friday, June 7, 2024. (AP Photo/Gerald Herbert)
An Aerodyne Mobile Laboratory, coordinated with researchers from Johns Hopkins University, drives through St. James Parish, La., Feb. 9, 2023, to monitor air quality near industrial sites. (Peter DeCarlo via AP)
A chemical and petroleum industrial corridor, that is a known source of ethylene oxide emissions, is seen from this aerial photo, in Ascension Parish, La., Friday, June 7, 2024. (AP Photo/Gerald Herbert)
A chemical and petroleum industrial corridor, that is a known source of ethylene oxide emissions, is seen along the Mississippi River from this aerial photo, in Ascension Parish, La., Friday, June 7, 2024. (AP Photo/Gerald Herbert)
A chemical and petroleum industrial corridor, that is a known source of ethylene oxide emissions, is seen from this aerial photo, in Ascension Parish, La., Friday, June 7, 2024. (AP Photo/Gerald Herbert)
An Aerodyne Mobile Laboratory staffed by researchers from Johns Hopkins University drives through St. James Parish, La., Feb. 9, 2023, to monitor air quality near industrial sites. (Peter DeCarlo via AP)