In February, the average concentration of PM2.5 in 339 prefectural-level and above cities nationwide was 45 micrograms per cubic meter, a year-on-year decrease of 2.2%; the average concentration of O3 was 99 micrograms per cubic meter, a year-on-year decrease of 4.8%; the average concentration of PM10 was 64 micrograms per cubic meter, a year-on-year decrease of 8.6%; the average concentration of SO2 was 9 micrograms per cubic meter, a year-on-year decrease of 10.0%; the average concentration of NO2 was 18 micrograms per cubic meter, a year-on-year decline of 35.7%; the average concentration of CO was 1.1 mg/m3, flat year-on-year.

In February, the average proportion of days with good air quality in 339 cities at prefecture level and above nationwide was 81.8%, down 1.3 percentage points year-on-year; the average proportion of days with heavy or above pollution was 4.0%, up 2.3 percentage points year-on-year; and the average proportion of days exceeding the standard caused by dust and sandy weather was 3.9%.

Proportion of days at various levels in 339 cities at prefecture level and above nationwide in February 2024

List of Top 20 and Bottom 20 Cities in Air Quality Ranking of 168 Key Cities in February 2024

Source: Ministry of Ecology and Environment