Trump seeks to loosen rules on dangerous PM2.5 pollution

Hilde Van Raemdonck

November 26, 2025

/epa

The US government is trying to roll back the particulate matter limits set by former President Joe Biden. The 2024 rule had cut the allowable ambient concentration of PM2.5 from 12 µg/m³ to 9 µg/m³ — a move aimed at significantly reducing air pollution and protecting public health. The

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