Air Pollution OZONE. Now yet another 'variable' for schools to figure out how to control inside classrooms. Some 'smoke particle OUTSIDE pollution' (PM2.5) can be controlled and vastly mitigated by recirculating through HVAC system filters (MERV 13 or better). Some COVID virus transmission can also be reduced by the same recirculation [or Outside Air Changes].

But bringing more air / recirculating work counter for Ozone and Smoke Particles!

At a certain point - compromise. (IMO) It is better for kids to 'lay low' inside and have recirculating air refiltered / min. new air with OZONE and Smoke. Smoke will be filtered out - otherwise it can permanently sick deep in young lungs. OZONE causes serious but more temporary problems (if not Chronic) and can only be chemically filtered. And COVID? What kid should get stuck with 'Long' Covid problems.

This isn`t the first time I see an article like this. And it is truly sad to be the witness of world-changing this way. I recently read about environmental issues at Web Link and realized that air and water pollution is one of the most common and dangerous problems. But, nevertheless, these are the problems that we are able to fix a little, including the use of environmentally friendly transport (bicycles or electric cars). Recently I traveled to Turkey (Istanbul) and visited the island, which is located near the city. I was pleasantly surprised, because there is no transport on the island, except for bicycles and small electric vehicles.