A thick layer of tan smog hangs at the height of the mountains over Los Angeles.

Climate Since Covid

Only time will tell what the final effects of the COVID shutdowns are on the environment. During the height of the lockdown, air quality improved almost immediately. NO2 and CO2 (from fossil fuels) both decreased. This effect was noticed most heavily in major cities, though arguably the whole world benefitted. Fine particulate matter, PM2.5, similarly dropped.