We have had to put spirometry and PFT on hold during COVID.  I am concerned that there is asthma symptoms or obstruction not being treated because we cannot assess this. 

During lockdowns there has been a reduction of air pollution.  Is there any evidence that the reduction of air pollution has contributed to a reduction in ER visits?  There are some studies that are correlating air pollution with increased COVID cases.  Is that because pollution may weaken the immune system?

Any recommendation with humidifiers or are they not recommended due to their high risk of contamination, and the risk of mold and dustmite growth?