National Ambient Air Quality Condition in March 2024 and January-March 2024

In March, the average concentration of PM2.5 in 339 prefectural-level and above cities nationwide was 34 micrograms per cubic meter, a year-on-year decrease of 5.6%; the average concentration of PM10 was 62 micrograms per cubic meter, a year-on-year decrease of 11.4%; the average concentration of O3 was 122 micrograms per cubic meter, a year-on-year decrease of 6.9%; the average concentration of SO2 was 8 micrograms per cubic meter, a year-on-year decrease of 11.1%; the average NO2 concentration was 23 micrograms per cubic meter, down 11.5% year-on-year; and the average concentration of CO was 0.9 milligrams per cubic meter, flat year-on-year.

In March, the average proportion of good air quality days in 339 cities at prefecture level and above nationwide was 90.4%, up 7.2 percentage points year-on-year; the average proportion of heavily polluted days and above was 1.0%, down 1.6 percentage points year-on-year; and the average proportion of exceeding the standard days caused by sand and dust weather was 5.7%.

From January to March, the average concentration of PM2.5 in 339 prefectural-level and above cities nationwide was 43 micrograms per cubic meter, a year-on-year decrease of 6.5%; the average concentration of PM10 was 67 micrograms per cubic meter, a year-on-year decrease of 11.8%; the average concentration of O3 was 111 micrograms per cubic meter, a year-on-year decrease of 5.9%; the average concentration of SO2 was 9 micrograms per cubic meter, a year-on-year decrease of 10.0%; and the average concentration of NO2 was 1.0%. down 10.0%; average concentration of NO2 was 25 micrograms per cubic meter, down 7.4% year-on-year; and average concentration of CO was 1.2 milligrams per cubic meter, flat year-on-year.

From January to March, the average proportion of good air quality days in 339 prefectural-level and above cities nationwide was 83.6%, up 3.5 percentage points year-on-year; the average proportion of heavily polluted days and above was 2.4%, down 0.9 percentage points year-on-year; and the average proportion of exceeding the standard days caused by sand and dust weather was 3.6%.

Proportion of days at all levels in 339 cities at prefecture level and above nationwide in January-March 2024

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

List of Top 20 and Bottom 20 Cities in Air Quality Ranking of 168 Key Cities in January-March 2024

Source: Ministry of Ecology and Environment