*****General introduction********
The dataset includes ground observations of the whole China and the city Beijing. China part in the dataset was measured by China National Environmental Monitoring Center and Beijing part by Beijing Municipal Environmental Monitoring Center. Both are hourly observation in a period of 2019-2020 (China) or 2018-2020 (Beijing). Except for observations data, longitude and latitude of stations are also included (file type is .xlsx.)

*****variables**********
PM2.5 (microgram m-3, Particulate Matter with dynamical diameter less than 2.5 micrometer)
PM2.5_24h (microgram m-3,  24-h average of PM2.5)
PM10 (microgram m-3, Particulate Matter with dynamical diameter less than 10 micrometer)
PM10_24h (microgram m-3,  24-h average of PM10)
AQI (Air Quality Index, China standard)
SO2 (microgram m-3,  sulfur dioxide)
SO2 (microgram m-3,  24-h average of SO2)
NO2 (microgram m-3, nitrogen dioxide)
NO2_24h (microgram m-3,  24-h average of NO2)
CO (milligram m-3,  carbon monoxide)
CO_24h (milligram m-3,  24-h average of CO)
O3 (microgram m-3,  ozone)
O3_24h (microgram m-3,  24-h average of O3)
O3_8h (microgram m-3, 8-h moving average of O3)
