atmospheric concentration; airborne concentration
Technical term used in environmental science, occupational health, and engineering to denote the amount of a substance present in a given volume of air.
Measure the airborne concentration of hazardous substances in the work environment.
The atmospheric concentration of carbon dioxide in this area is rising year by year.
Refers specifically to concentration in the ambient atmosphere, while 気中濃度 can also refer to indoor or enclosed air spaces.
General term for concentration; 気中濃度 specifies that the medium is air.
Compound of 気中 (in the air) + 濃度 (concentration).