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n, a professor with fudan university39。s department of environmental science and engineering who specializes in atmospheric particulates, said seasonal influences explain the recordbreaking data in both beijing and shanghai.take shanghai as an example. it just celebrated its cleanest summer in 20xx sea breeze from the southeast is helpful in diluting pollutants in the air. however, the monsoons ing from the northwest in the winter usually bring dirty air from the north, yang said.agricultural straw burning in nearby areas also contributed to part of shanghai39。s reading, according to wang lin, a researcher at fudan university39。s department of environmental science and engineering.but it39。s hard for the shanghai government to prohibit farmers in the neighboring regions from doing so, wang said.according to lin, the forecaster, shanghai39。s air was set to improve on wednesday night and early thursday morning. the next wave of cold air is much cleaner because of the clearing of