[Improved system of standards for the air quality over populated places].
D000397:Air Pollution / Q000517:prevention & control*; D006262:Health / Q000592:standards*; D008452:Maximum Allowable Concentration; D013997:Time Factors; D014586:USSR; D014504:Urban Health / Q000592:standards*
O sovershenstvovanii sistemy normativov chistoty vozdushnogo basseĭna naselennykh mest.