Evolving Air Quality Standards
Legal Planet
NOVEMBER 9, 2023
The annual standard — basically the worst day of the year — has gone from 260 μg/m³ in 1971, down to 150 μg/m³ in 1987, 65 μg/m³ in 2006, and 12 μg/m³ in 2012, where they have stayed ever since. standard of between 9 and 10, or 10-25% lower than the 2012 standard.
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