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2017高考英语二轮复习讲义（阅读理解）及训练17：（答案） 小试牛刀--------阅读理解 Air quality in Shanghai worsened last week compared with the previous week, according to the latest report from the Shanghai Environment Monitoring Centre. The average air pollution index (API) for sulphur dioxide (SO2) remain almost unchanged from the previous week, but the APIs for nitrogen oxide (NOx) and total suspended (悬浮) particles (TSP) rose by 35 and 27 percent.The overall quality still belonged to class 2 category. Nitrogen oxide, caused mainly by vehicle exhaust and burning of cooking gas, was still the major pollutant of the week. The Shanghai Environmental Monitoring Centre operates six automatic air monitors in the city’s Putuo, Yangpu, Luwan, Hongkou, Jing’an and Xuhui districts. API 140 120 100 80 60 40 20 NOX SO2 TSP 12 13 14 15 16 17 18(October) 0-50: excellent 51-100: good 101-200: slight pollution 201-300: medium pollution 301-400: heavy pollution | 
