Progress toward a uniform air pollution index.
1975
G C Thom, and
W R Ott
UI
MeSH Term
Description
Entries
D011786
Quality Control
A system for verifying and maintaining a desired level of quality in a product or process by careful planning, use of proper equipment, continued inspection, and corrective action as required. (Random House Unabridged Dictionary, 2d ed)
The presence of contaminants or pollutant substances in the air (AIR POLLUTANTS) that interfere with human health or welfare, or produce other harmful environmental effects. The substances may include GASES; PARTICULATE MATTER; or volatile ORGANIC CHEMICALS.
Air Quality,Air Pollutions,Pollution, Air
D014481
United States
A country in NORTH AMERICA between CANADA and MEXICO.