SmogRank / Taiwan / Taiwan

Air quality in Yilan

Taiwan, Taiwan. PM2.5 from 1 reference monitor, updated hourly.

13.0µg/m³
Moderate

Latest hour (22:00 UTC), 0.9× the WHO 24-hour guideline. 24-hour average 10.2 µg/m³.

Rank among 1,324 cities

24 hours#421of 1,324, at 10.2 µg/m³
7 days#319of 2,299, at 12.4 µg/m³
30 days#434of 2,313, at 9.5 µg/m³
This year#761of 2,176, at 9.6 µg/m³

The last 12 months, day by day

1102031Nov 2025DecJan 2026FebMarAprMayJunJulAugSepOct2025-11-01: no data2025-11-02: no data2025-11-03: no data2025-11-04: no data2025-11-05: no data2025-11-06: no data2025-11-07: no data2025-11-08: no data2025-11-09: no data2025-11-10: no data2025-11-11: no data2025-11-12: no data2025-11-13: no data2025-11-14: no data2025-11-15: no data2025-11-16: no data2025-11-17: no data2025-11-18: no data2025-11-19: 9.2 µg/m³2025-11-20: 11.1 µg/m³2025-11-21: 9.4 µg/m³2025-11-22: 10.4 µg/m³2025-11-23: 9.0 µg/m³2025-11-24: 9.8 µg/m³2025-11-25: 25.4 µg/m³2025-11-26: 15.5 µg/m³2025-11-27: 9.6 µg/m³2025-11-28: 27.3 µg/m³2025-11-29: 16.8 µg/m³2025-11-30: 11.8 µg/m³2025-12-01: 9.8 µg/m³2025-12-02: 7.5 µg/m³2025-12-03: 14.6 µg/m³2025-12-04: 9.8 µg/m³2025-12-05: 5.9 µg/m³2025-12-06: 6.0 µg/m³2025-12-07: 8.5 µg/m³2025-12-08: 9.5 µg/m³2025-12-09: 7.0 µg/m³2025-12-10: 8.0 µg/m³2025-12-11: 10.9 µg/m³2025-12-12: 15.8 µg/m³2025-12-13: 6.3 µg/m³2025-12-14: 15.8 µg/m³2025-12-15: 14.1 µg/m³2025-12-16: 9.4 µg/m³2025-12-17: 9.2 µg/m³2025-12-18: 13.0 µg/m³2025-12-19: 7.0 µg/m³2025-12-20: 7.0 µg/m³2025-12-21: 11.0 µg/m³2025-12-22: 7.0 µg/m³2025-12-23: 7.2 µg/m³2025-12-24: 9.6 µg/m³2025-12-25: 8.0 µg/m³2025-12-26: 7.3 µg/m³2025-12-27: 3.6 µg/m³2025-12-28: 3.5 µg/m³2025-12-29: 4.6 µg/m³2025-12-30: 4.4 µg/m³2025-12-31: 3.7 µg/m³2026-01-01: 5.7 µg/m³2026-01-02: 9.0 µg/m³2026-01-03: 10.0 µg/m³2026-01-04: 7.1 µg/m³2026-01-05: 12.3 µg/m³2026-01-06: 15.2 µg/m³2026-01-07: 23.4 µg/m³2026-01-08: 20.1 µg/m³2026-01-09: 19.0 µg/m³2026-01-10: 13.5 µg/m³2026-01-11: 19.3 µg/m³2026-01-12: 13.6 µg/m³2026-01-13: 16.3 µg/m³2026-01-14: 17.9 µg/m³2026-01-15: 13.2 µg/m³2026-01-16: 14.4 µg/m³2026-01-17: 18.0 µg/m³2026-01-18: 16.7 µg/m³2026-01-19: 13.6 µg/m³2026-01-20: 7.4 µg/m³2026-01-21: 5.5 µg/m³2026-01-22: 4.9 µg/m³2026-01-23: 5.6 µg/m³2026-01-24: 6.1 µg/m³2026-01-25: 7.7 µg/m³2026-01-26: 11.3 µg/m³2026-01-27: 9.5 µg/m³2026-01-28: 6.1 µg/m³2026-01-29: 11.8 µg/m³2026-01-30: 9.8 µg/m³2026-01-31: 5.8 µg/m³2026-02-01: 4.7 µg/m³2026-02-02: 6.3 µg/m³2026-02-03: 18.8 µg/m³2026-02-04: 9.5 µg/m³2026-02-05: 7.7 µg/m³2026-02-06: 12.5 µg/m³2026-02-07: 7.4 µg/m³2026-02-08: 19.0 µg/m³2026-02-09: 9.2 µg/m³2026-02-10: 6.6 µg/m³2026-02-11: 12.7 µg/m³2026-02-12: 17.5 µg/m³2026-02-13: 11.2 µg/m³2026-02-14: 12.3 µg/m³2026-02-15: 14.6 µg/m³2026-02-16: 15.3 µg/m³2026-02-17: 8.9 µg/m³2026-02-18: 11.4 µg/m³2026-02-19: 20.4 µg/m³2026-02-20: 16.0 µg/m³2026-02-21: 15.8 µg/m³2026-02-22: 19.1 µg/m³2026-02-23: 13.0 µg/m³2026-02-24: 10.2 µg/m³2026-02-25: 7.2 µg/m³2026-02-26: 6.8 µg/m³2026-02-27: 8.0 µg/m³2026-02-28: 6.3 µg/m³2026-03-01: 6.5 µg/m³2026-03-02: 7.8 µg/m³2026-03-03: 6.4 µg/m³2026-03-04: 1.8 µg/m³2026-03-05: 4.4 µg/m³2026-03-06: 4.5 µg/m³2026-03-07: 13.1 µg/m³2026-03-08: 4.5 µg/m³2026-03-09: 4.0 µg/m³2026-03-10: 5.8 µg/m³2026-03-11: 6.9 µg/m³2026-03-12: 10.9 µg/m³2026-03-13: 16.5 µg/m³2026-03-14: 15.5 µg/m³2026-03-15: 8.7 µg/m³2026-03-16: 7.6 µg/m³2026-03-17: 8.6 µg/m³2026-03-18: 10.0 µg/m³2026-03-19: 8.8 µg/m³2026-03-20: 9.1 µg/m³2026-03-21: 6.0 µg/m³2026-03-22: 6.1 µg/m³2026-03-23: 11.2 µg/m³2026-03-24: 8.6 µg/m³2026-03-25: 13.5 µg/m³2026-03-26: 12.8 µg/m³2026-03-27: 8.5 µg/m³2026-03-28: 10.0 µg/m³2026-03-29: 14.3 µg/m³2026-03-30: 21.7 µg/m³2026-03-31: 18.9 µg/m³2026-04-01: 10.4 µg/m³2026-04-02: 7.7 µg/m³2026-04-03: 8.3 µg/m³2026-04-04: 9.7 µg/m³2026-04-05: 8.2 µg/m³2026-04-06: 13.1 µg/m³2026-04-07: 8.6 µg/m³2026-04-08: 7.5 µg/m³2026-04-09: 8.6 µg/m³2026-04-10: 17.5 µg/m³2026-04-11: 16.5 µg/m³2026-04-12: 19.9 µg/m³2026-04-13: 19.3 µg/m³2026-04-14: 18.7 µg/m³2026-04-15: 16.8 µg/m³2026-04-16: 7.6 µg/m³2026-04-17: 13.1 µg/m³2026-04-18: 15.5 µg/m³2026-04-19: 14.2 µg/m³2026-04-20: 13.7 µg/m³2026-04-21: 14.5 µg/m³2026-04-22: 12.5 µg/m³2026-04-23: 13.3 µg/m³2026-04-24: 5.9 µg/m³2026-04-25: 7.9 µg/m³2026-04-26: 9.9 µg/m³2026-04-27: 12.9 µg/m³2026-04-28: 14.0 µg/m³2026-04-29: 10.5 µg/m³2026-04-30: 3.8 µg/m³2026-05-01: 9.5 µg/m³2026-05-02: 8.3 µg/m³2026-05-03: 9.4 µg/m³2026-05-04: 13.0 µg/m³2026-05-05: 6.8 µg/m³2026-05-06: 4.4 µg/m³2026-05-07: 5.0 µg/m³2026-05-08: 7.5 µg/m³2026-05-09: 2.8 µg/m³2026-05-10: 2.8 µg/m³2026-05-11: 7.6 µg/m³2026-05-12: 8.3 µg/m³2026-05-13: 8.3 µg/m³2026-05-14: 6.6 µg/m³2026-05-15: 6.7 µg/m³2026-05-16: 6.2 µg/m³2026-05-17: 7.3 µg/m³2026-05-18: 7.4 µg/m³2026-05-19: 6.5 µg/m³2026-05-20: 7.5 µg/m³2026-05-21: no data2026-05-22: no data2026-05-23: no data2026-05-24: no data2026-05-25: no data2026-05-26: 15.1 µg/m³2026-05-27: 13.6 µg/m³2026-05-28: 14.2 µg/m³2026-05-29: 10.2 µg/m³2026-05-30: 13.7 µg/m³2026-05-31: 11.3 µg/m³2026-06-01: 10.9 µg/m³2026-06-02: 10.8 µg/m³2026-06-03: 14.6 µg/m³2026-06-04: 12.3 µg/m³2026-06-05: 4.8 µg/m³2026-06-06: 3.8 µg/m³2026-06-07: 8.4 µg/m³2026-06-08: 4.8 µg/m³2026-06-09: 2.6 µg/m³2026-06-10: 2.6 µg/m³2026-06-11: 3.5 µg/m³2026-06-12: 2.2 µg/m³2026-06-13: 3.5 µg/m³2026-06-14: 4.7 µg/m³2026-06-15: 5.5 µg/m³2026-06-16: 4.4 µg/m³2026-06-17: 5.3 µg/m³2026-06-18: 4.5 µg/m³2026-06-19: 7.8 µg/m³2026-06-20: 10.5 µg/m³2026-06-21: 11.8 µg/m³2026-06-22: 12.7 µg/m³2026-06-23: 9.2 µg/m³2026-06-24: 12.6 µg/m³2026-06-25: 11.3 µg/m³2026-06-26: 5.9 µg/m³2026-06-27: 5.9 µg/m³2026-06-28: 3.7 µg/m³2026-06-29: 7.5 µg/m³2026-06-30: 6.5 µg/m³2026-07-01: 7.7 µg/m³2026-07-02: 7.7 µg/m³2026-07-03: no data2026-07-04: no data2026-07-05: 5.1 µg/m³2026-07-06: 6.4 µg/m³2026-07-07: 6.2 µg/m³2026-07-08: 10.5 µg/m³2026-07-09: 10.1 µg/m³2026-07-10: 8.4 µg/m³2026-07-11: 3.8 µg/m³2026-07-12: 8.8 µg/m³2026-07-13: 9.9 µg/m³2026-07-14: 8.1 µg/m³2026-07-15: 7.8 µg/m³2026-07-16: 10.1 µg/m³2026-07-17: 9.2 µg/m³2026-07-18: 7.1 µg/m³2026-07-19: 6.8 µg/m³2026-07-20: 5.8 µg/m³2026-07-21: 10.3 µg/m³2026-07-22: 11.7 µg/m³2026-07-23: 14.1 µg/m³2026-07-24: 9.2 µg/m³2026-07-25: 7.2 µg/m³2026-07-26: 8.3 µg/m³2026-07-27: 5.3 µg/m³2026-07-28: 5.3 µg/m³2026-07-29: 5.0 µg/m³2026-07-30: 7.0 µg/m³2026-07-31: 10.1 µg/m³2026-08-01: 7.2 µg/m³2026-08-02: 8.1 µg/m³2026-08-03: 6.5 µg/m³2026-08-04: 5.5 µg/m³2026-08-05: 7.8 µg/m³2026-08-06: 11.8 µg/m³2026-08-07: 12.6 µg/m³2026-08-08: 8.5 µg/m³2026-08-09: 6.0 µg/m³2026-08-10: 10.8 µg/m³2026-08-11: 9.6 µg/m³2026-08-12: 16.0 µg/m³2026-08-13: 13.6 µg/m³2026-08-14: 15.3 µg/m³2026-08-15: 10.7 µg/m³2026-08-16: 9.3 µg/m³2026-08-17: 7.3 µg/m³2026-08-18: 5.1 µg/m³2026-08-19: 5.8 µg/m³2026-08-20: 4.2 µg/m³2026-08-21: 6.5 µg/m³2026-08-22: 5.7 µg/m³2026-08-23: 5.5 µg/m³2026-08-24: 5.4 µg/m³2026-08-25: 5.1 µg/m³2026-08-26: 7.5 µg/m³2026-08-27: 8.1 µg/m³2026-08-28: 9.0 µg/m³2026-08-29: 9.0 µg/m³2026-08-30: 7.4 µg/m³2026-08-31: 4.2 µg/m³2026-09-01: 4.4 µg/m³2026-09-02: 4.4 µg/m³2026-09-03: 3.7 µg/m³2026-09-04: 6.0 µg/m³2026-09-05: 7.0 µg/m³2026-09-06: 4.5 µg/m³2026-09-07: 11.8 µg/m³2026-09-08: 12.5 µg/m³2026-09-09: 10.5 µg/m³2026-09-10: 10.4 µg/m³2026-09-11: 9.0 µg/m³2026-09-12: 7.1 µg/m³2026-09-13: 5.8 µg/m³2026-09-14: 7.0 µg/m³2026-09-15: 11.4 µg/m³2026-09-16: 12.4 µg/m³2026-09-17: 10.8 µg/m³2026-09-18: 10.0 µg/m³2026-09-19: no data2026-09-20: 8.7 µg/m³2026-09-21: 9.4 µg/m³2026-09-22: 11.5 µg/m³2026-09-23: 9.0 µg/m³2026-09-24: 8.7 µg/m³2026-09-25: 10.5 µg/m³2026-09-26: 15.1 µg/m³2026-09-27: 13.5 µg/m³2026-09-28: 12.1 µg/m³2026-09-29: 12.4 µg/m³2026-09-30: 11.0 µg/m³2026-10-01: no data
38 of 317 measured days were over the WHO 24-hour guideline (15 µg/m³). One row per month, one square per local day.
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

Last 4 days, hour by hour

15302026-10-01 03:00 UTC: 9.0 µg/m³2026-10-01 04:00 UTC: 10.0 µg/m³2026-10-01 05:00 UTC: 7.0 µg/m³2026-10-01 06:00 UTC: 11.0 µg/m³2026-10-01 07:00 UTC: 9.0 µg/m³2026-10-01 08:00 UTC: 5.0 µg/m³2026-10-01 09:00 UTC: 8.0 µg/m³2026-10-01 10:00 UTC: 8.0 µg/m³2026-10-01 11:00 UTC: 8.0 µg/m³2026-10-01 12:00 UTC: 15.0 µg/m³2026-10-01 13:00 UTC: 12.0 µg/m³2026-10-01 14:00 UTC: 9.0 µg/m³2026-10-01 15:00 UTC: 12.0 µg/m³2026-10-01 16:00 UTC: 11.0 µg/m³2026-10-01 17:00 UTC: 7.0 µg/m³2026-10-01 18:00 UTC: 11.0 µg/m³2026-10-01 19:00 UTC: 13.0 µg/m³2026-10-01 20:00 UTC: 14.0 µg/m³2026-10-01 21:00 UTC: 11.0 µg/m³2026-10-01 22:00 UTC: 13.0 µg/m³Sep 28Sep 29Sep 30Oct 1
Times in UTC. Dashed line: WHO 24-hour guideline (15 µg/m³).

Its world rank, day by day

#1#2168NovDecJanFebMarAprMayJunJulAugSep
Rank on each day's board (1 = most polluted city that day).

2026 against 2025, month by month

15Jan 2025: 11.6 µg/m³Jan 2026: 11.9 µg/m³JanFeb 2025: 8.3 µg/m³Feb 2026: 11.7 µg/m³FebMar 2025: 10.0 µg/m³Mar 2026: 9.5 µg/m³MarApr 2025: 14.4 µg/m³Apr 2026: 12.0 µg/m³AprMay 2025: 10.1 µg/m³May 2026: 8.5 µg/m³MayJun 2025: 6.9 µg/m³Jun 2026: 7.2 µg/m³JunJul 2026: 8.0 µg/m³JulAug 2026: 8.2 µg/m³AugSep 2025: 6.0 µg/m³Sep 2026: 9.3 µg/m³SepOct 2025: 7.1 µg/m³OctNov 2025: 13.8 µg/m³NovDec 2025: 8.5 µg/m³Dec
Faded bars: 2025. A month shows once it has 10 measured days.

This week against past years

This weekThis week: 12.4 µg/m³12.420252025: 6.5 µg/m³6.520242024: 3.3 µg/m³3.3
Mean PM2.5 for 25 Sept to 1 Oct in each year. Dashed line: WHO 24-hour guideline.

Monitors

StationOperatorType
宜蘭縣 - 宜蘭OGDL-Taiwan 1.0TaiwanReference

The city's value is the median of its reference monitors each hour, when at least a third of them report (three are always enough); low-cost sensors are listed but not counted when reference monitors exist. Data via OpenAQ; licences as listed. How we rank. Embed this on your site.

Other cities in Taiwan

30-day averages, µg/m³. All of Taiwan.

Updated 2026-10-01 23:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.