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Ground level ozone and its precursors were measured from July 10 to September 30, 2009 within Tianjin. The data were used to analyze differences in ozone photochemical oxidant production in urban and rural areas. Results showed more pronounced risk of O 3 exposure at the rural site, Wuqing. During the observation period, ozone varied monthly, peaking in Jul. and reaching a minimum in Sep....
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