A passive air cleaner that is rated as 90 percent efficient using the Atmospheric Dust Spot procedure, he said, would only achieve an efficiency rating of 60 percent using what is known as the DOP test, a method named after an abbreviation for the substance dioctylphthalate, which is used in the test because it evaporates to produce particles that are all exactly 0.3 microns in size.
22.
A passive air cleaner that is rated as 90 percent efficient using the Atmospheric Dust Spot procedure, he said, would only achieve an efficiency rating of 60 percent using what is known as the DOP test, a method named after an abbreviation for the substance dioctylphthalate, which is used in the test because it evaporates to produce particles that are all exactly 0 . 3 microns in size.
23.
The microscopic particles of atmospheric dust, sea salt and smoke known as aerosols are meteorological and climatic will-o'- the-wisps _ now here, now not, materializing somewhat randomly in a given parcel of air and then disappearing in a few days . But they are essential to the formation of clouds and the production of rain and snow, and they also have a considerable cooling influence on the earth's temperature.
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