Gaseous pollutants in the city of Urumqi, Xinjiang: spatial and temporal trends, sources and implications

摘要: Abstract Nitrogen oxides (NO 2 and NO x ), ozone (O 3 sulphur dioxide (SO benzene, toluene, ethylbenzene xylenes (BTEX) ammonia (NH ) were determined in ambient air Urumqi, the capital of Xinjiang NW China, from 2010 to 2012 by applying diffusive sampling approach. Principal component analysis (PCA) was used identify major contributions atmospheric pollution. Four extensive measurement campaigns performed city, where very few investigations had been made on The impacts pollutants four city districts assessed. Considerably high mean annual concentrations observed Urumqi for all toxicants; these latter ranged between 46 158 μg m −3 33–126 μg m 83–141 μg m 46–82 μg m (BTEX). BTEX overall released industrial plants motor vehicles. Huge consumption fossil fuels energy generation domestic heating purposes looked as principal factors causing pollution levels recorded. In winter, coal burning houses recognized a contributor SO budgets. Important loads found district hosting slaughter meat treatment facilities. Other primary influencing patterns variously related diffusion chemicals across atmosphere, i.e.: wind speed direction, stagnation occurrence inversion events; besides, important roles played relevant emission sources (especially seasonality photochemistry.