Dati sulla qualità dell'aria forniti da: the China National Urban air quality real-time publishing platform (全国城市空气质量实时发布平台) (106.37.208.233:20035) and the U.S. Consulate Chengdu Air Quality Monitor (china.usembassy-china.org.cn) and the Chengdu Environmental Protection Agency (成都市环境监测中心站_成都市环境监测中心站) (sthj.chengdu.gov.cn)