DirtMechanic
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So..particulate matter...10 to the negative 6 or .00001 or millionths in size have been getting cleaned up for some decades now. Good stuff right? But guess what! Those aerosols reflected heat and cooled the earth so as we clean the air up the heat can come back in. Sorry for the mind bender. They call that small stuff "particulate matter" or PM if you are googling about.