Bad-air episodes in Taiwan
8 times since January 2023, many cities in Taiwan had air at least twice as dirty as their usual for the time of year on the same days. The largest reached 24 cities: Taiwan, February 2025.
2026
2025
- Taiwan, November 202528 November 2025, 1 day17 cities36Magong
- Taiwan, November 202525 November 2025, 1 day12 cities28Taibao
- Taiwan, March 202511 March 2025, 1 day13 cities55Douliu
- Taiwan, February 202526 to 28 February 2025, 3 days24 cities70Jincheng
- Taiwan, February 202517 February 2025, 1 day21 cities48Jincheng
- Taiwan, January 202521 to 22 January 2025, 2 days22 cities55Yuanlin
- Taiwan, January 202514 to 15 January 2025, 2 days14 cities60Jincheng
Each row: one bar per day, as tall as the number of cities counted that day and coloured by their median level; the number of cities; the highest daily reading and where. An episode is a run of days when many cities close to each other (four or more within 350 km on a day, 8 or more in all) each had a daily PM2.5 mean of at least 25 µg/m³ and at least 2 times their usual for that time of year. Found in our own measurements, not picked by hand. How we find episodes.