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Field data collected during the GDF 93 project indicated that during polluted conditions (SO 2(g) > 2 ppbv, NH 3 (g) > 0.5 ppbv), sulphate and ammonium concentrations in air increased through cloud chemistry by as much as 25%. Similarly, ammonia was seen to be consumed by cloud processing and decreased by up to 20%. In comparatively clean conditions (SO 2...
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