Is the air quality good in Beijing?
As of September 17, 2026, at 12:00 PM CST (GMT+8), air quality in Beijing, China, is unhealthy, with an AQI of 175. PM2.5 is the dominant pollutant, while elevated PM10 and ozone also contribute to the poor air quality.
Beijing's average PM2.5 concentration in 2025 was 26.8 µg/m³, corresponding to an AQI of 85, classified as "moderate" and 5.72 times the WHO annual guideline, significantly below today's readings, reflecting an acute autumn-onset pollution episode.
For a complete, real-time view of current pollution levels, see Beijing's air quality map.
Beijing, China, ranked among the most polluted major cities globally, as of September 17, 2026, at 12:00 PM (local time). Source: IQAir.
Air quality map of Beijing, China, as of September 17, 2026, at 12:00 PM (local time). Source: IQAir.
When will the air quality improve in Beijing?
The hourly forecast shows AQI declining steadily from 175 this morning to around 96 by midnight as southerly winds strengthen through the afternoon and evening, with humidity rising to 77%, which will help suppress ozone formation and improve atmospheric dispersion.
More sustained autumn improvement typically depends on stronger frontal systems sweeping pollution from the Beijing-Tianjin-Hebei region.
However, as coal-fired heating season approaches from October onward, conditions are likely to deteriorate again.
Hourly air quality forecast for Beijing, China, as of September 17, 2026, at 12:00 PM (local time). Source: IQAir.
What is causing poor air quality in Beijing?
Today's episode reflects a convergence of two distinct pollution mechanisms: elevated PM2.5 from vehicle emissions, coal combustion, and regional industrial transport from neighboring Hebei, Shandong, and Shanxi provinces, alongside elevated ozone driven by residual summer photochemical activity under warm temperatures and moderate solar radiation (1).
Research confirms that since China implemented its Air Pollution Prevention and Control Action Plan in 2013, annual average PM2.5 has declined while ozone concentrations have increased in Beijing, making dual PM2.5 and ozone episodes increasingly common in transitional seasons (2).
The four leading local sources of Beijing's PM2.5 are automobiles at 31.1%, coal combustion at 22.4%, industrial production at 18.1%, and construction dust at 14.3%, compounded by regional transport from surrounding industrial zones (3).
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.
