I was curious how far air pollution levels had fallen in the South Coast due to coronavirus, so I plotted up 24-hour average PM2.5 levels (Particulate Matter less than 2.5 micron diameter) for a normally fairly-polluted site (Long Beach) for the last month.It looks like typical levels have fallen about half, from 14 to 7 ug/m3.
I'll bet thwre is a government agwnxy that couls bemefit from your curoousity and skill set.
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