SmogRank / Cleaner or dirtier / Taiwan

Taiwan: cleaner or dirtier, 2026

In Taiwan, 43 cities have enough days in both years to compare 2026 so far (1 January to 6 October) with the same days of 2025: 21 got dirtier and 19 cleaner.

The 21 cities that got dirtier, biggest rise first

#	City	2025	2026	Change
1	PuliTaiwan, Taiwan	58	63	+2.9 µg/m³+23%
2	TaitungTaiwan, Taiwan	36	48	+2.2 µg/m³+34%
3	ShulinTaipei, Taiwan	57	60	+1.7 µg/m³+14%
4	HengchunTaiwan, Taiwan	33	42	+1.5 µg/m³+25%
5	GuanshanTaiwan, Taiwan	38	44	+1.2 µg/m³+18%
6	Chiayi CityTaiwan, Taiwan	65	67	+1.1 µg/m³+7%
7	MagongTaiwan, Taiwan	55	57	+1.1 µg/m³+10%
8	ZhushanTaiwan, Taiwan	64	66	+1.0 µg/m³+6%
9	NantouTaiwan, Taiwan	63	65	+1.0 µg/m³+6%
10	KeelungTaiwan, Taiwan	53	54	+0.8 µg/m³+8%
11	YilanTaiwan, Taiwan	51	53	+0.8 µg/m³+9%
12	Hualien CityTaiwan, Taiwan	41	46	+0.8 µg/m³+11%
13	DouliuTaiwan, Taiwan	68	69	+0.7 µg/m³+4%
14	BeigangTaiwan, Taiwan	64	66	+0.6 µg/m³+4%
15	ErlinTaiwan, Taiwan	63	65	+0.6 µg/m³+4%
16	ZhongliaoTaiwan, Taiwan	61	62	+0.5 µg/m³+3%
17	MiaoliTaiwan, Taiwan	58	58	+0.3 µg/m³+2%
18	YuanlinTaiwan, Taiwan	66	66	+0.2 µg/m³+1%
19	TainanTaiwan, Taiwan	66	66	+0.2 µg/m³+1%
20	XinyingTaiwan, Taiwan	65	65	+0.1 µg/m³+1%
21	ChanghuaTaiwan, Taiwan	61	61	+0.1 µg/m³+1%

The 19 cities that got cleaner, biggest fall first

#	City	2025	2026	Change
1	ShenzhenTaiwan, Taiwan	60	57	−1.7 µg/m³−12%
2	HsinchuTaiwan, Taiwan	60	56	−1.7 µg/m³−12%
3	ZhubeiTaiwan, Taiwan	59	56	−1.5 µg/m³−11%
4	ToufenTaiwan, Taiwan	59	57	−1.5 µg/m³−11%
5	DaxiTaiwan, Taiwan	60	58	−1.3 µg/m³−9%
6	ChaozhouTaiwan, Taiwan	67	64	−1.3 µg/m³−7%
7	JinchengFukien, Taiwan	70	68	−1.3 µg/m³−7%
8	TaoyuanTaiwan, Taiwan	59	56	−1.3 µg/m³−10%
9	FengshanTakao, Taiwan	72	70	−1.0 µg/m³−5%
10	KaohsiungTakao, Taiwan	68	66	−0.9 µg/m³−5%
11	New Taipei CityTaipei, Taiwan	58	57	−0.5 µg/m³−4%
12	XizhiTaipei, Taiwan	59	58	−0.5 µg/m³−4%
13	TaibaoTaiwan, Taiwan	64	63	−0.4 µg/m³−2%
14	XizhouTaiwan, Taiwan	58	58	−0.4 µg/m³−3%
15	SanzhiTaipei, Taiwan	43	41	−0.4 µg/m³−5%
16	ErlunTaiwan, Taiwan	68	68	−0.3 µg/m³−2%
17	TaichungTaiwan, Taiwan	62	61	−0.2 µg/m³−1%
18	TaipeiTaiwan, Taiwan	58	57	−0.2 µg/m³−2%
19	NeiliTaiwan, Taiwan	60	60	−0.1 µg/m³−1%

Means in US AQI over the days a city was measured in both years, the same calendar days each year; a city needs 55% of the days paired, and at least 30. The change is in µg/m³ and per cent. How we compare.

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

Updated 2026-10-07 12:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.