air conditioning airtag Air-conditioning, the control of temperature, humidity, purity, and motion of air in an enclosed space, independent of outside conditions. An early method of cooling air as practiced in India was to hang wet grass mats over windows where they cooled incoming air by evaporation
a useful definition of an air pollutant Air pollution is the contamination of air due to the presence of substances called pollutants in the atmosphere that are harmful to the health of humans and other living beings, or cause damage to the climate or to materials.1
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