National Ambient Air Quality Conditions in January 2024

In January, the average proportion of good air quality days in 339 prefectural-level and above cities nationwide was 78.5%, up 4.2 percentage points year-on-year; the average proportion of days with heavy and above pollution was 2.2%, down 3.2 percentage points year-on-year; the average concentration of PM2.5 was 51 micrograms per cubic meter (μg/m3 ), down 8.9% year-on-year; the average concentration of O3 was 85 micrograms per cubic meter (μg/m3), down 5.6% year-on-year ; the average concentration of PM10 was 74 micrograms per cubic meter, a year-on-year decrease of 14.9%; the average concentration of SO2 was 10 micrograms per cubic meter, a year-on-year decrease of 9.1%; the average concentration of NO2 was 32 micrograms per cubic meter, a year-on-year increase of 18.5%; and the average concentration of CO was 1.2 milligrams per cubic meter, a year-on-year decrease of 7.7%.

In January, the average proportion of days exceeding the standard caused by dusty weather in 339 cities at prefecture level and above nationwide was 1.2%.

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

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

Source: Ministry of Ecology and Environment