Is the air quality good in Chengdu, China?
As of September 3, 2026, at 12:00 PM CST (UTC+8), air quality in Chengdu, China, is poor, with the AQI exceeding 110, classified as "unhealthy for sensitive groups," with PM2.5 as the dominant pollutant.
The average PM2.5 concentration in 2025 for Chengdu was 33.8 µg/m³, corresponding to an AQI of 97, classified as "moderate" and 6.76 times the WHO annual guideline of 5 µg/m³.
Today's readings are above that annual average, indicating a seasonal deterioration as autumn approaches.
For a complete, real-time view of current pollution levels, see Chengdu's air quality map.
Chengdu, China, ranked among the most polluted major cities globally, as of September 3, 2026, at 12:00 PM (local time). Source: IQAir.
Air quality map of Chengdu, China, September 3, 2026, at 12:00 PM (local time). Source: IQAir.
When will the air quality improve in Chengdu, China?
From year to year, Chengdu's air quality hits its worst levels in December, continuing into the new year before gradually improving from March onward, with the most polluted months being December, January, and February.
September marks the beginning of a gradual seasonal deterioration as temperatures drop, winds weaken, and the Sichuan Basin's natural topography increasingly traps pollutants.
Short-term improvement depends on rainfall or stronger winds to disperse accumulated pollutants. Lasting improvement requires continued enforcement of China's national emission reduction targets.
Hourly air quality forecast for Chengdu, China, as of September 3, 2026, at 12:00 PM (local time). Source: IQAir.
What is causing poor air quality in Chengdu, China?
Chengdu's location in the Sichuan Basin makes it subject to lower wind speeds and higher humidity levels, allowing smoke and haze from vehicles to accumulate in the air without dispersing.
Research on spatiotemporal drivers of air pollution in Chengdu identifies industrial emissions, vehicle exhaust, coal combustion, and secondary aerosol formation as the dominant contributors to PM2.5, with spatial heterogeneity driven by the uneven distribution of industrial zones across the metropolitan area (1).
Industrial factories across the city operate at high capacity, often running on fossil fuels such as coal, which puts out large amounts of chemical pollutants and fine particulate matter.
As autumn approaches, the weakening of the summer monsoon reduces the atmospheric ventilation that had been helping to disperse pollutants throughout the warmer months, leading to a rapid buildup of PM2.5 across the basin (2).
How can I protect myself from poor air quality?
- Get a free air quality app for real-time air quality alerts and forecasts.
- Shut doors and windows and set the HVAC to recirculate mode.
- Contribute to your community’s outdoor air quality data.
- Stay indoors when air quality is poor; if you do need to go outdoors, wear a KN95/FFP2 mask.
- Run a high-performance air purifier to filter particles, gases, and other pollutants.
