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The brown cloud is particulate from diesels. Particulate is dangerous to us in different ways than CO2. Work has been done to try to limit particulate production from diesels but the brown clouds around the country still form. In Phoenix, I can see the smog forming along the highways exclusively, mostly from semis. Particulate is ash from incomplete combustion of diesel fuel. It is actually less dangerous because it eventually falls to earth. The result of complete combustion is CO2 plus H2O. So all the effort to control pollution over the decades pushed us towards complete combustion, to eliminate the visible particulate. Then someone came up with climate change and CO2.

Hmmm, damned if you do and damned if you don’t.

BTW, not only does the particulate from cars invade our systems through our alveoli, but now we have micro-plastic residue joining in.

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Semi trucks. Not turbo diesels with DEF.

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"through our alveoli"

John,

Your comment is borderline obscene. My alveoli is washed, clean, and of prodigious proportion. I am known far and wide for the size of my alveoli...and I have pics to prove it! People, perhaps such as yourself, with small alveoli, discount the admiration of others for size, and that is a mistake. Pics on request....gaze upon my alveoli and despair!

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Well, just remember to keep your alveoli in a safe place.

HA!

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