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

Chongqing City in China has suffered from serious air pollution and acid ra in 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 Cho ngqing are discussed, the. reduction efficiency for sulfur dioxide (SO,) wi th the bio-briquetting of the raw coal that is one of countermeasures for e mission 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 co nditions, the reducing efficiency of sulfur SO, emission from high sulfur c oal-biomass briquette amounted to 87%. The field investigation indicated th at SO, indoor concentrations in case of using bio-briquette dropped to 1/2- 1/3 of the raw coal.