How Many Particulars Are There in Chicago to Day?

In the three cities where we are, i'm in new york, angeles, in philadelphia, levits and chicago, on average in two thousand 19 micrograms of particulate matter per cubic meter. The good news is levit you are suffering very low particular matter in ch Chicago to day. As if to day, chChicago only at eight point seven micrograms per cubic meter; Philadelphia and new York have very high levels to day. Is there that much variation in particulare matter? I would say it feels like a one in terms of likelihood of being true, and if true, a tend in terms of importance.