Sample snapshot — search a route to replace this with your origin, destination, and travel date.
Origin (departure city)
Nanjing
42 Nanjing (南京)
Good — Air quality is satisfactory. Pollution poses little or no risk for most people.
For travelers: Outdoor sightseeing and station transfers are fine for almost everyone.
Main driver today: Ozone (O₃) — Forms on sunny days from other pollutants — can irritate lungs during afternoon outdoor activity.
Supporting readings (what the numbers are)
- Fine particles (PM2.5) 21Tiny soot and dust from traffic, coal, and industry — the usual driver of smog in Chinese cities.
- Coarse dust (PM10) 29Larger particles from roads, construction, and wind-blown dust.
- Ozone (O₃) drives index 41.9Forms on sunny days from other pollutants — can irritate lungs during afternoon outdoor activity.
- Nitrogen dioxide (NO₂) 3.2A traffic-related gas — higher near busy roads and rail approaches.
- Carbon monoxide (CO) 2.8From incomplete fuel burning — usually low outdoors but worth noting in tunnels or heavy traffic.
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Upcoming holidays
Official public holidays in the next ~8 weeks. Run a train search to see how they line up with your travel date.
