In the San Francisco Bay area, Covid levels are comparable to the most recent winter surge
Source: Coronavirus spiking in wastewater in California, Florida and Texas as cases rise
The major Covid testing as described above is not by putting filters in air conditioning units in big chain stores or even overhanging sidewalks outside government offices. Why do you think that is?
In my studies I have had several virology classes, several immunology classes, pathogens classes, and actually did PCR work in my post doc. Back in the ’70s to prevent flu on airlines they took the doors off the bathrooms and they have taken the doors off of bathrooms in many other large commercial areas as well. Why do you think that is?
All the testing that showed Covid being in the air was done by PCR identification of DNA _fragments_, not by detecting _viable_ virus. What could happen?
The best current scientific knowledge is that virtually all cold and flu viruses are spread almost entirely by contaminated hands after using restrooms. This is the reasoning behind the first two bits of real scientific facts above. Going and looking for the data is hard! People that take the easy way
are easily fooled.