In the picture above you can see that before china was under quarantine for COVID-19 the NO2 levels were at the normal levels for them. Which is not a good level. After they began being quarantined for COVID-19 check out how much better their air quality got. So it makes sense to me that once we are all able to come out of quarantine maybe we should do everything possible to try to reduce the pollutants that we cause by our everyday stuff.  Walk or Bike when possible, buy local instead of mass produced, and keep life simple and healthy.