SmogRank / Episodes / Taiwan
Taiwan, December 2024
For 1 day, on 14 December 2024, 18 cities in Taiwan had PM2.5 at least twice their usual for the time of year. The worst reading was Neili, Taiwan: 46.1 µg/m³ on 14 December, about 3.4× its usual 13.6.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 18 in 1 country
Days 1 14 December 2024
Worst day 14 December 18 cities counted
Furthest above usual 3.8× Taoyuan
Day by day
Play 14 December 18 cities at twice their usual or more
Xizhou Yuanlin Nantou Puli Zhushan Erlun Douliu Beigang Chiayi City Taibao Hualien City Xinying Yilan Sanzhi Yongkang Tainan Taitung Fengshan Kaohsiung Chaozhou Hengchun Jincheng Ishigaki Taichung Erlin Changhua Buzi Magong Miaoli Taipei New Taipei City Neili Shulin Zhudong Xizhi Toufen Zhubei Hsinchu Keelung Taoyuan Daxi 11 Dec 12 13 14 15 16 17 Every measured city in the area, coloured by its PM2.5 that day; a dark ring marks a city at twice its usual or more. Bars: cities counted each day, coloured by their median level. Choose a day or press play; without JavaScript, the days link to that day's world ranking.
How it spread
Neili Neili, 11 December: 11.1 µg/m³, 0.8× usual Neili, 12 December: 9.3 µg/m³, 0.7× usual Neili, 13 December: 7.3 µg/m³, 0.5× usual Neili, 14 December: 46.1 µg/m³, 3.4× usual Neili, 15 December: 25.1 µg/m³, 1.8× usual Neili, 16 December: 17.4 µg/m³, 1.3× usual Neili, 17 December: 14.9 µg/m³, 1.1× usual Xizhi Xizhi, 11 December: 11.2 µg/m³, 0.9× usual Xizhi, 12 December: 8.0 µg/m³, 0.6× usual Xizhi, 13 December: 6.5 µg/m³, 0.5× usual Xizhi, 14 December: 44.0 µg/m³, 3.5× usual Xizhi, 15 December: 20.9 µg/m³, 1.7× usual Xizhi, 16 December: 16.2 µg/m³, 1.3× usual Xizhi, 17 December: 13.5 µg/m³, 1.1× usual Toufen Toufen, 11 December: 8.8 µg/m³, 0.7× usual Toufen, 12 December: 8.7 µg/m³, 0.7× usual Toufen, 13 December: 7.3 µg/m³, 0.6× usual Toufen, 14 December: 43.4 µg/m³, 3.5× usual Toufen, 15 December: 24.7 µg/m³, 2.0× usual Toufen, 16 December: 16.4 µg/m³, 1.3× usual Toufen, 17 December: 14.8 µg/m³, 1.2× usual Daxi Daxi, 11 December: 10.4 µg/m³, 0.9× usual Daxi, 12 December: 7.3 µg/m³, 0.6× usual Daxi, 13 December: 6.4 µg/m³, 0.6× usual Daxi, 14 December: 42.8 µg/m³, 3.8× usual Daxi, 15 December: 22.9 µg/m³, 2.0× usual Daxi, 16 December: 14.7 µg/m³, 1.3× usual Daxi, 17 December: 14.1 µg/m³, 1.2× usual Zhubei Zhubei, 11 December: 7.0 µg/m³, 0.6× usual Zhubei, 12 December: 7.4 µg/m³, 0.6× usual Zhubei, 13 December: 3.9 µg/m³, 0.3× usual Zhubei, 14 December: 41.8 µg/m³, 3.6× usual Zhubei, 15 December: 22.3 µg/m³, 1.9× usual Zhubei, 16 December: 13.9 µg/m³, 1.2× usual Zhubei, 17 December: 13.6 µg/m³, 1.2× usual Taoyuan Taoyuan, 11 December: 9.8 µg/m³, 0.9× usual Taoyuan, 12 December: 6.8 µg/m³, 0.6× usual Taoyuan, 13 December: 4.1 µg/m³, 0.4× usual Taoyuan, 14 December: 41.7 µg/m³, 3.8× usual Taoyuan, 15 December: 21.2 µg/m³, 1.9× usual Taoyuan, 16 December: 11.8 µg/m³, 1.1× usual Taoyuan, 17 December: 10.2 µg/m³, 0.9× usual Hsinchu Hsinchu, 11 December: 7.0 µg/m³, 0.6× usual Hsinchu, 12 December: 6.4 µg/m³, 0.6× usual Hsinchu, 13 December: 5.5 µg/m³, 0.5× usual Hsinchu, 14 December: 40.8 µg/m³, 3.6× usual Hsinchu, 15 December: 22.3 µg/m³, 2.0× usual Hsinchu, 16 December: 14.9 µg/m³, 1.3× usual Hsinchu, 17 December: 13.3 µg/m³, 1.2× usual Shulin Shulin, 11 December: 5.9 µg/m³, 0.5× usual Shulin, 12 December: 5.0 µg/m³, 0.4× usual Shulin, 13 December: 4.0 µg/m³, 0.3× usual Shulin, 14 December: 40.5 µg/m³, 3.4× usual Shulin, 15 December: 22.0 µg/m³, 1.9× usual Shulin, 16 December: 12.1 µg/m³, 1.0× usual Shulin, 17 December: 11.6 µg/m³, 1.0× usual New Taipei City New Taipei City, 11 December: 7.9 µg/m³, 0.7× usual New Taipei City, 12 December: 6.6 µg/m³, 0.6× usual New Taipei City, 13 December: 5.0 µg/m³, 0.4× usual New Taipei City, 14 December: 39.3 µg/m³, 3.4× usual New Taipei City, 15 December: 20.9 µg/m³, 1.8× usual New Taipei City, 16 December: 13.7 µg/m³, 1.2× usual New Taipei City, 17 December: 12.8 µg/m³, 1.1× usual Keelung Keelung, 11 December: 5.9 µg/m³, 0.6× usual Keelung, 12 December: 5.7 µg/m³, 0.5× usual Keelung, 13 December: 3.5 µg/m³, 0.3× usual Keelung, 14 December: 38.5 µg/m³, 3.7× usual Keelung, 15 December: 17.4 µg/m³, 1.7× usual Keelung, 16 December: 12.3 µg/m³, 1.2× usual Keelung, 17 December: 10.4 µg/m³, 1.0× usual Miaoli Miaoli, 11 December: 9.6 µg/m³, 0.7× usual Miaoli, 12 December: 5.2 µg/m³, 0.4× usual Miaoli, 13 December: 4.8 µg/m³, 0.4× usual Miaoli, 14 December: 36.8 µg/m³, 2.8× usual Miaoli, 15 December: 22.5 µg/m³, 1.7× usual Miaoli, 16 December: 14.7 µg/m³, 1.1× usual Miaoli, 17 December: 13.4 µg/m³, 1.0× usual Taipei Taipei, 11 December: 8.0 µg/m³, 0.7× usual Taipei, 12 December: 7.3 µg/m³, 0.6× usual Taipei, 13 December: 5.5 µg/m³, 0.5× usual Taipei, 14 December: 36.0 µg/m³, 3.1× usual Taipei, 15 December: 21.7 µg/m³, 1.9× usual Taipei, 16 December: 14.9 µg/m³, 1.3× usual Taipei, 17 December: 14.0 µg/m³, 1.2× usual Magong Magong, 11 December: 7.0 µg/m³, 0.5× usual Magong, 12 December: 11.4 µg/m³, 0.9× usual Magong, 13 December: 6.9 µg/m³, 0.5× usual Magong, 14 December: 35.2 µg/m³, 2.8× usual Magong, 15 December: 21.7 µg/m³, 1.7× usual Magong, 16 December: 12.8 µg/m³, 1.0× usual Magong, 17 December: 13.0 µg/m³, 1.0× usual Buzi Buzi, 11 December: 8.0 µg/m³, 0.6× usual Buzi, 12 December: 7.7 µg/m³, 0.6× usual Buzi, 13 December: 6.8 µg/m³, 0.5× usual Buzi, 14 December: 35.0 µg/m³, 2.6× usual Buzi, 15 December: 23.6 µg/m³, 1.7× usual Buzi, 16 December: 18.0 µg/m³, 1.3× usual Buzi, 17 December: 16.1 µg/m³, 1.2× usual Zhudong Zhudong, 11 December: 6.3 µg/m³, 0.6× usual Zhudong, 12 December: 4.5 µg/m³, 0.5× usual Zhudong, 13 December: 4.2 µg/m³, 0.4× usual Zhudong, 14 December: 34.8 µg/m³, 3.5× usual Zhudong, 15 December: 18.5 µg/m³, 1.9× usual Zhudong, 16 December: 11.0 µg/m³, 1.1× usual Zhudong, 17 December: 9.5 µg/m³, 1.0× usual Erlin Erlin, 11 December: 9.5 µg/m³, 0.6× usual Erlin, 12 December: 9.9 µg/m³, 0.6× usual Erlin, 13 December: 6.5 µg/m³, 0.4× usual Erlin, 14 December: 33.1 µg/m³, 2.1× usual Erlin, 15 December: 25.4 µg/m³, 1.6× usual Erlin, 16 December: 17.3 µg/m³, 1.1× usual Erlin, 17 December: 17.9 µg/m³, 1.2× usual Changhua Changhua, 11 December: 8.3 µg/m³, 0.6× usual Changhua, 12 December: 7.7 µg/m³, 0.6× usual Changhua, 13 December: 5.7 µg/m³, 0.4× usual Changhua, 14 December: 30.8 µg/m³, 2.2× usual Changhua, 15 December: 22.0 µg/m³, 1.6× usual Changhua, 16 December: 14.9 µg/m³, 1.1× usual Changhua, 17 December: 14.9 µg/m³, 1.1× usual Taichung Taichung, 11 December: 9.9 µg/m³, 0.7× usual Taichung, 12 December: 6.6 µg/m³, 0.5× usual Taichung, 13 December: 5.8 µg/m³, 0.4× usual Taichung, 14 December: 28.2 µg/m³, 2.0× usual Taichung, 15 December: 21.1 µg/m³, 1.5× usual Taichung, 16 December: 14.4 µg/m³, 1.0× usual Taichung, 17 December: 15.9 µg/m³, 1.1× usual 11 Dec 12 13 14 15 16 17 Every counted city, in the order the episode reached them, 3 days before to 3 after. Each square is a day, coloured by that day's PM2.5; outlined: at twice the city's usual or more. Good 0–50
Moderate 51–100
Sensitive groups 101–150
Unhealthy 151–200
Very unhealthy 201–300
Hazardous 301+
Every city it reached
City Days Highest Usual Above usual
Taoyuan Taiwan 1 14 December 11.0 3.8× Daxi Taiwan 1 14 December 11.4 3.8× Keelung Taiwan 1 14 December 10.4 3.7× Hsinchu Taiwan 1 14 December 11.2 3.6× Zhubei Taiwan 1 14 December 11.5 3.6× Toufen Taiwan 1 14 December 12.4 3.5× Xizhi Taipei, Taiwan 1 14 December 12.6 3.5× Zhudong Taiwan 1 14 December 10.0 3.5× Shulin Taipei, Taiwan 1 14 December 11.8 3.4× Neili Taiwan 1 14 December 13.6 3.4× New Taipei City Taipei, Taiwan 1 14 December 11.7 3.4× Taipei Taiwan 1 14 December 11.6 3.1× Miaoli Taiwan 1 14 December 13.1 2.8× Magong Taiwan 1 14 December 12.8 2.8× Buzi Taiwan 1 14 December 13.7 2.6× Changhua Taiwan 1 14 December 13.9 2.2× Erlin Taiwan 1 14 December 15.5 2.1× Taichung Taiwan 1 14 December 14.0 2.0×
Daily means in µg/m³. Usual: the city's median for this time of year (its days within 21 days of the date, every year, leaving out the week around it). Above usual: its highest day against that.
Against other episodes in Taiwan
Number 6 of 12 episodes in Taiwan since our records began, by cities reached.
Taiwan, February 2025 24 Taiwan, January 2025 22 Taiwan, February 2025 21 Taiwan, November 2024 21 Taiwan, March 2024 20 Taiwan, December 2024 18 Taiwan, November 2025 17 Taiwan, May 2024 16 Taiwan, January 2025 14 Taiwan, February 2026 13 Taiwan, March 2025 13 Taiwan, November 2025 12 Bars: cities reached; colour: the level of the episode's highest daily reading.
Use this page SmogRank, Taiwan, December 2024: 18 cities with PM2.5 at twice their usual or more, 14 December 2024, smogrank.com/episodes/2024-12-taiwan (accessed 3 October 2026).
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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms .
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 . Values are each city's daily mean of its own monitors; causes are the usual kinds for a pattern like this, not a confirmed source.
