Not sure why you're dismissing lab studies because measuring the filter on that exhaust is one good way to figure out what's going on. But okay, this virus is less well understood than pollution. Look at SARS is best we can do probably.https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3322931/ …
It was spreading pretty efficiently in Wuhan when they had to shut it down! Agree not all places explode exponentially, but Wuhan certainly did.
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