Studies on atmospheric pollution, acid rain and emission control for their precursors in Chongqing, China

Chongqing City in China has suffered from serious air pollution and acid rain caused by low graded raw coal (sulfur=ca. 3-5%, ash=ca. 30%) combustion. In this paper, the situation of atmospheric pollution and acid rain in Chongqing are discussed, the. reduction efficiency for sulfur dioxide (SO,) with the bio-briquetting of the raw coal that is one of countermeasures for emission control of air pollutants due to domestic consumes was determined. The research indicated that the frequency of acid rain was high, more than 50% at urban area, and its pH was low, about 4.5. Under our experimental conditions, the reducing efficiency of sulfur SO, emission from high sulfur coal-biomass briquette amounted to 87%. The field investigation indicated that SO, indoor concentrations in case of using bio-briquette dropped to 1/2-1/3 of the raw coal.