Seeking environmental indicators

Consult the standards on the website of the Environmental Protection Administration, such as the environmental air quality standards; in addition, refer to the health standards for industrial enterprises (under the old standards) regarding the requirements for the atmospheric environment in residential areas

Air Quality Indicators for Major Cities (2003) Unit: mg/m³ City Inhalable Particulates (PM10) Sulfur Dioxide (SO2) Nitrogen Dioxide (NO2) Number of Days with Air Quality at or Better than Grade II Key Pollutant Indicators Beijing 0.141 0.061 0.072 224 Inhalable Particulates Tianjin 0.133 0.074 0.052 264 Inhalable Particulates Shijiazhuang 0.175 0.152 0.044 211 Sulfur Dioxide Taiyuan 0.172 0.099 0.031 181 Inhalable Particulates Hohhot 0.116 0.039 0.046 286 Inhalable Particulates Shenyang 0.135 0.052 0.036 298 Inhalable Particulates Changchun 0.098 0.012 0.022 342 Inhalable Particulates Harbin 0.121 0.043 0.065 297 Inhalable Particulates Shanghai 0.097 0.043 0.057 325 Inhalable Particulates Nanjing 0.120 0.03 0.049 297 Inhalable Particulates Hangzhou 0.119 0.049 0.056 293 Inhalable Particulates Hefei 0.100 0.012 0.025 287 Inhalable Particulates Fuzhou 0.080 0.008 0.034 344 Inhalable Particulates Nanchang 0.100 0.051 0.034 315 Inhalable Particulates Jinan 0.149 0.064 0.046 214 Inhalable Particulates Zhengzhou 0.107 0.050 0.033 308 Inhalable Particulates Wuhan 0.133 0.049 0.052 246 Inhalable Particulates Changsha 0.135 0.081 0.038 245 Inhalable Particulates/Sulfur Dioxide Guangzhou 0.099 0.059 0.072 314 Inhalable Particulates Nanning 0.072 0.047 0.032 348 Sulfur Dioxide Haikou 0.030 0.009 0.013 365 Inhalable Particulates Chongqing 0.147 0.115 0.046 237 Sulfur Dioxide Chengdu 0.118 0.052 0.046 312 Inhalable Particulates Guiyang 0.104 0.089 0.019 351 Sulfur Dioxide Kunming 0.086 0.045 0.033 363 Inhalable Particulates Lhasa 0.065 0.002 0.029 353 Inhalable Particulates Xi’an 0.136 0.057 0.035 252 Inhalable Particulates Lanzhou 0.174 0.086 0.050 207 Inhalable Particulates Xining 0.139 0.031 0.031 261 Inhalable Particulates Yinchuan 0.132 0.063 0.037 291 Inhalable Particulates Urumqi 0.127 0.097 0.055 282 Sulfur Dioxide Source: **State Environmental Protection Administration (the same for subsequent tables).