PM2.5 levels vary by region across the United States, but the national average in 2020 was about 8 micrograms per cubic meter, down from 13 in 2000, according to the Environmental Protection Agency. The WHO’s new guidelines set the recommended level at 5.
“When you inhale these particles, they are able to penetrate deeper into your respiratory system than larger particles,” said Michael Kleeman, a professor of civil and environmental engineering at the University of California, Davis. “Once there, the small particles kick off a cascade of biochemical processes that cause inflammation.”
The U.S. standards, last updated in 2012, are slightly less strict than the WHO’s current – and former – guidance, but the EPA said comparing the two standards is not so straightforward. According to him, this sets the EPA apart from the WHO guidelines, which as the world body notes, are not “legally binding standards,” but a tool for member states.
That picture reminds me of futuristic Dune or Blade Runner - 80s versions of course
And at the end nothing will be done. Just wait and see.
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Rollbacks by GOP weakened Obama-era limits on planet-warming carbon dioxide emissions from power plants, cars, trucks; removed protections from more than half nation’s wetlands; and withdrew legal justification for restricting mercury emissions from power plants.
The same WHO that declared masks have no effect and the Wuhan virus was not man-made?
While nationwide air quality is already worse than the new threshold, it’s especially bad in California, Oregon, Nevada, Idaho and Washington, where levels of particulate matter are more than twice the recommended limit.