SmogRank / Episodes / Taiwan
Taiwan, March 2024
For 2 days, from 16 to 17 March 2024, 20 cities in Taiwan had PM2.5 at least twice their usual for the time of year. The worst reading was Erlun, Taiwan: 50.5 µg/m³ on 16 March, about 2.5× its usual 20.6.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 20 in 1 country
Days 2 16 to 17 March 2024
Worst day 16 March 20 cities counted
Furthest above usual 3.0× Taoyuan
Day by day
Play 16 March 20 cities at twice their usual or more
Puli Zhushan Nantou Yuanlin Douliu Taichung Xizhou Chiayi City Hualien City Yongkang Taitung Yilan Magong Fengshan Chaozhou Xizhi Sanzhi Keelung Hengchun Jincheng Changhua Tainan Kaohsiung Buzi Xinying Beigang Taibao Erlin Neili Erlun Miaoli Taipei Toufen New Taipei City Zhubei Hsinchu Shulin Zhudong Taoyuan Daxi 13 Mar 14 15 16 17 18 19 20 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
Erlun Erlun, 13 March: no reading Erlun, 14 March: no reading Erlun, 15 March: no reading Erlun, 16 March: 50.5 µg/m³, 2.5× usual Erlun, 17 March: 38.5 µg/m³, 1.9× usual Erlun, 18 March: 35.1 µg/m³, 1.7× usual Erlun, 19 March: 14.8 µg/m³, 0.7× usual Erlun, 20 March: 26.3 µg/m³, 1.3× usual Erlin Erlin, 13 March: no reading Erlin, 14 March: no reading Erlin, 15 March: no reading Erlin, 16 March: 46.8 µg/m³, 2.4× usual Erlin, 17 March: 41.1 µg/m³, 2.1× usual Erlin, 18 March: 32.2 µg/m³, 1.7× usual Erlin, 19 March: 15.7 µg/m³, 0.8× usual Erlin, 20 March: 27.7 µg/m³, 1.4× usual Daxi Daxi, 13 March: no reading Daxi, 14 March: no reading Daxi, 15 March: no reading Daxi, 16 March: 46.1 µg/m³, 3.0× usual Daxi, 17 March: 26.7 µg/m³, 1.7× usual Daxi, 18 March: 17.9 µg/m³, 1.2× usual Daxi, 19 March: 9.1 µg/m³, 0.6× usual Daxi, 20 March: 20.8 µg/m³, 1.3× usual Beigang Beigang, 13 March: no reading Beigang, 14 March: no reading Beigang, 15 March: no reading Beigang, 16 March: 45.5 µg/m³, 2.2× usual Beigang, 17 March: 37.1 µg/m³, 1.8× usual Beigang, 18 March: 38.4 µg/m³, 1.9× usual Beigang, 19 March: 17.4 µg/m³, 0.9× usual Beigang, 20 March: 26.1 µg/m³, 1.3× usual Taibao Taibao, 13 March: no reading Taibao, 14 March: no reading Taibao, 15 March: no reading Taibao, 16 March: 45.1 µg/m³, 2.3× usual Taibao, 17 March: 41.5 µg/m³, 2.1× usual Taibao, 18 March: 32.8 µg/m³, 1.7× usual Taibao, 19 March: 17.8 µg/m³, 0.9× usual Taibao, 20 March: 26.5 µg/m³, 1.4× usual Taoyuan Taoyuan, 13 March: no reading Taoyuan, 14 March: no reading Taoyuan, 15 March: no reading Taoyuan, 16 March: 44.5 µg/m³, 3.0× usual Taoyuan, 17 March: 30.2 µg/m³, 2.1× usual Taoyuan, 18 March: 14.7 µg/m³, 1.0× usual Taoyuan, 19 March: 8.3 µg/m³, 0.6× usual Taoyuan, 20 March: 17.7 µg/m³, 1.2× usual Kaohsiung Kaohsiung, 13 March: no reading Kaohsiung, 14 March: no reading Kaohsiung, 15 March: no reading Kaohsiung, 16 March: 44.5 µg/m³, 2.1× usual Kaohsiung, 17 March: 26.9 µg/m³, 1.3× usual Kaohsiung, 18 March: 38.6 µg/m³, 1.8× usual Kaohsiung, 19 March: 26.0 µg/m³, 1.2× usual Kaohsiung, 20 March: 19.7 µg/m³, 0.9× usual Hsinchu Hsinchu, 13 March: no reading Hsinchu, 14 March: no reading Hsinchu, 15 March: no reading Hsinchu, 16 March: 43.4 µg/m³, 2.7× usual Hsinchu, 17 March: 29.5 µg/m³, 1.8× usual Hsinchu, 18 March: 24.2 µg/m³, 1.5× usual Hsinchu, 19 March: 11.5 µg/m³, 0.7× usual Hsinchu, 20 March: 24.6 µg/m³, 1.5× usual Shulin Shulin, 13 March: no reading Shulin, 14 March: no reading Shulin, 15 March: no reading Shulin, 16 March: 43.1 µg/m³, 2.7× usual Shulin, 17 March: 31.0 µg/m³, 1.9× usual Shulin, 18 March: 21.9 µg/m³, 1.4× usual Shulin, 19 March: 12.8 µg/m³, 0.8× usual Shulin, 20 March: 25.8 µg/m³, 1.6× usual Tainan Tainan, 13 March: no reading Tainan, 14 March: no reading Tainan, 15 March: no reading Tainan, 16 March: 42.7 µg/m³, 2.0× usual Tainan, 17 March: 31.1 µg/m³, 1.5× usual Tainan, 18 March: 35.7 µg/m³, 1.7× usual Tainan, 19 March: 20.3 µg/m³, 1.0× usual Tainan, 20 March: 24.1 µg/m³, 1.1× usual Zhubei Zhubei, 13 March: no reading Zhubei, 14 March: no reading Zhubei, 15 March: no reading Zhubei, 16 March: 42.3 µg/m³, 2.7× usual Zhubei, 17 March: 29.5 µg/m³, 1.9× usual Zhubei, 18 March: 22.3 µg/m³, 1.4× usual Zhubei, 19 March: 9.9 µg/m³, 0.6× usual Zhubei, 20 March: 21.7 µg/m³, 1.4× usual Neili Neili, 13 March: no reading Neili, 14 March: no reading Neili, 15 March: no reading Neili, 16 March: 40.0 µg/m³, 2.4× usual Neili, 17 March: 29.4 µg/m³, 1.7× usual Neili, 18 March: 19.6 µg/m³, 1.2× usual Neili, 19 March: 10.1 µg/m³, 0.6× usual Neili, 20 March: 22.6 µg/m³, 1.3× usual Xinying Xinying, 13 March: no reading Xinying, 14 March: no reading Xinying, 15 March: no reading Xinying, 16 March: 39.7 µg/m³, 2.1× usual Xinying, 17 March: 29.8 µg/m³, 1.6× usual Xinying, 18 March: 36.7 µg/m³, 1.9× usual Xinying, 19 March: 17.0 µg/m³, 0.9× usual Xinying, 20 March: 22.6 µg/m³, 1.2× usual Toufen Toufen, 13 March: no reading Toufen, 14 March: no reading Toufen, 15 March: no reading Toufen, 16 March: 39.5 µg/m³, 2.5× usual Toufen, 17 March: 29.8 µg/m³, 1.9× usual Toufen, 18 March: 23.1 µg/m³, 1.5× usual Toufen, 19 March: 10.8 µg/m³, 0.7× usual Toufen, 20 March: 22.4 µg/m³, 1.4× usual Miaoli Miaoli, 13 March: no reading Miaoli, 14 March: no reading Miaoli, 15 March: no reading Miaoli, 16 March: 38.5 µg/m³, 2.5× usual Miaoli, 17 March: 25.0 µg/m³, 1.7× usual Miaoli, 18 March: 22.1 µg/m³, 1.5× usual Miaoli, 19 March: 8.4 µg/m³, 0.6× usual Miaoli, 20 March: 20.5 µg/m³, 1.4× usual Zhudong Zhudong, 13 March: no reading Zhudong, 14 March: no reading Zhudong, 15 March: no reading Zhudong, 16 March: 38.3 µg/m³, 2.8× usual Zhudong, 17 March: 28.2 µg/m³, 2.1× usual Zhudong, 18 March: 18.1 µg/m³, 1.3× usual Zhudong, 19 March: 10.3 µg/m³, 0.8× usual Zhudong, 20 March: 20.9 µg/m³, 1.5× usual New Taipei City New Taipei City, 13 March: no reading New Taipei City, 14 March: no reading New Taipei City, 15 March: no reading New Taipei City, 16 March: 37.3 µg/m³, 2.6× usual New Taipei City, 17 March: 27.3 µg/m³, 1.9× usual New Taipei City, 18 March: 16.0 µg/m³, 1.1× usual New Taipei City, 19 March: 10.1 µg/m³, 0.7× usual New Taipei City, 20 March: 22.1 µg/m³, 1.5× usual Taipei Taipei, 13 March: no reading Taipei, 14 March: no reading Taipei, 15 March: no reading Taipei, 16 March: 36.0 µg/m³, 2.5× usual Taipei, 17 March: 22.0 µg/m³, 1.5× usual Taipei, 18 March: 18.6 µg/m³, 1.3× usual Taipei, 19 March: 10.8 µg/m³, 0.8× usual Taipei, 20 March: 21.7 µg/m³, 1.5× usual Buzi Buzi, 13 March: no reading Buzi, 14 March: no reading Buzi, 15 March: no reading Buzi, 16 March: 35.4 µg/m³, 2.1× usual Buzi, 17 March: 25.3 µg/m³, 1.5× usual Buzi, 18 March: 26.5 µg/m³, 1.6× usual Buzi, 19 March: 11.3 µg/m³, 0.7× usual Buzi, 20 March: 22.2 µg/m³, 1.3× usual Changhua Changhua, 13 March: no reading Changhua, 14 March: no reading Changhua, 15 March: no reading Changhua, 16 March: 34.5 µg/m³, 2.0× usual Changhua, 17 March: 24.7 µg/m³, 1.5× usual Changhua, 18 March: 26.7 µg/m³, 1.6× usual Changhua, 19 March: 10.7 µg/m³, 0.6× usual Changhua, 20 March: 20.7 µg/m³, 1.2× usual 13 Mar 14 15 16 17 18 19 20 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 2 16 March 14.7 3.0× Daxi Taiwan 1 16 March 15.5 3.0× Zhudong Taiwan 2 16 March 13.7 2.8× Zhubei Taiwan 1 16 March 15.5 2.7× Shulin Taipei, Taiwan 1 16 March 16.0 2.7× Hsinchu Taiwan 1 16 March 16.3 2.7× New Taipei City Taipei, Taiwan 1 16 March 14.4 2.6× Miaoli Taiwan 1 16 March 15.1 2.5× Toufen Taiwan 1 16 March 15.7 2.5× Taipei Taiwan 1 16 March 14.4 2.5× Erlun Taiwan 1 16 March 20.6 2.5× Erlin Taiwan 2 16 March 19.4 2.4× Neili Taiwan 1 16 March 16.8 2.4× Taibao Taiwan 2 16 March 19.5 2.3× Beigang Taiwan 1 16 March 20.4 2.2× Buzi Taiwan 1 16 March 16.8 2.1× Kaohsiung Takao, Taiwan 1 16 March 21.5 2.1× Xinying Taiwan 1 16 March 19.2 2.1× Tainan Taiwan 1 16 March 21.0 2.0× Changhua Taiwan 1 16 March 17.0 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 5 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, March 2024: 20 cities with PM2.5 at twice their usual or more, 16 to 17 March 2024, smogrank.com/episodes/2024-03-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.
