Particulates, AQI and the daily cycle
Air
The air-quality panel shows three cuts of one problem: monthly PM2.5 fine-particle concentration with winter peaks, the yearly split of days by AQI category, and the daily NO₂ curve that almost traces the road-traffic profile.
−1.4 / yr
34 µg
PM2.5
+9 / yr
199
Good-air days
35%
PM2.5 share
6
Pollutants
Monthly series; the dashed line marks the WHO 15 µg/m³ guideline.
How many days a year fell into each category.
Share of monitored pollutants in the latest year.
A day of NO₂ — almost a copy of traffic.
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