American air got dirtier in 2021, according to the latest national estimate from Swiss technology firm IQAir. That increase isn’t just a reversion to pre-pandemic norms, either: data from several thousand air quality monitors from public and private sources show that national average fine particle pollution increased by about 15 percent between 2019 and 2021.
I didn't know that morality is the tip of the iceberg! (great article.)