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What is the biggest source of air pollution?

cars / power plants or farms? Do you believe latest study that says it's farms? Or is it all just crap? Fertilizers/ manure release ammonia, NH3, into the air & combine to generate tiny, gag-inducing particles that are less than 2.5 microns

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Tamara Wilhite (tamarawilhite) says

5 months ago
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    ptosis 5 months ago

    A volcanic winter would counter global warming for a couple of years too maybe.