In February 2024 the US Environmental Protection Agency finalised the new National Ambient Air Quality Standard (NAAQS) for PM2.5, reducing the limit from 12.0 µg/m3 to 9.0 µg/m3.
The US Environmental Protection Agency (US EPA) proposes to tighten national air quality standards for fine particle matter (PM2.5) for the first time since 2012.
The website of the US EPA presents an inventory of GHG emissions for 1990 to 2016, but web pages containing detailed climate analysis were removed one year ago.
After a review of scientific evidence, the US Environmental Protection Agency (EPA) on 14 July proposed to retain the current national ambient air quality standards ..
The first global, long-term satellite study of airborne ammonia gas has revealed increasing levels of the pollutant over four of the world’s most productive agricultural regions.
