The current Standard is the revision of GB 13271-91 Emission Standard of Air Pollutants for Coal--burning Boilers. The main changes include the followings: further identification of the applicable scope of the Standard; addition of the maximum allowable emission limits of flue dust, flue gas blackness and SO2 of coal-fueled boilers with capacity ﹤0.7MW(1t/h) and the maximum allowable emission limits of flue dust, flue gas blackness, SO2 and NOx of oil-burning and gas-burning boilers. The contents of the current Standard (including the implementation time) is same as that of Emission Standard of Air Pollutants for Coal--burning Boilers (GWPB 3-1999) issued on December 3, 1999 by the State Environmental Protection Administration and replace it from its date of implementation.

Emission standard of air pollutants for coal--burning oil-burnig gas-fired boilers (GB 13271-2001)