During most of January, I recorded the daily AQI (Air Quality Index) (PM 2.5) for Chengdu & Beijing from the website AQICN.org.
Unfortunately, Chengdu’s air pollution was much worse than Beijing’s during January, see below:
JANUARY 2016 – CHENGDU AIR vs BEIJING AIR (AQI)(PM 2.5) Daily AQI (PM 2.5) – measured once per day*
LOWER NUMBER = CLEANER AIR
Chengdu daily AQI (average) = 165 (UNHEALTHY)
Beijing daily AQI (average) = 87 (MODERATE)
*Data obtained from the website AQICN.org (not my site)