In April, the average concentration of PM2.5 in 339 prefectural-level and above cities nationwide was 28 micrograms per cubic meter, flat year-on-year; the average concentration of PM10 was 53 micrograms per cubic meter, a year-on-year decrease of 3.6%; the average concentration of O3 was 138 micrograms per cubic meter, a year-on-year decrease of 0.7%; the average concentration of SO2 was 8 micrograms per cubic meter, flat year-on-year; the average concentration of NO2 was 19 micrograms per cubic meter , flat year-on-year; and the average concentration of CO was 0.8 mg/m3 , flat year-on-year.

In April, the average proportion of good air quality days in 339 prefectural-level and above cities nationwide was 89.8%, up 8.7 percentage points year-on-year; the average proportion of heavily polluted days and above was 1.2%, down 3.5 percentage points year-on-year; and the average proportion of exceeding the standard days caused by sand and dust weather was 4.4%, of which the proportion of heavily polluted days was 1.1%.

Proportion of days at all levels in 339 cities at prefecture level and above nationwide in April 2024

List of top 20 and bottom 20 cities in terms of air quality in 168 key cities in April 2024

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

Source: Ministry of Ecology and Environment