2023年のカナダの野火による長距離PM2.5汚染と健康への影響
Qiang Zhang1, Yuexuanzi Wang2, Qingyang Xiao3
1Ministry of Education Key Laboratory for Earth System Modeling, Department of Earth System Science, Tsinghua University, Beijing, China. qiangzhang@tsinghua.edu.cn.
Nature
|September 10, 2025
まとめ
2023年に発生したカナダの極端な森林火災は,大気質の問題を引き起こし,世界の粒子状物質 (PM2.5) 曝露を増加させた. この汚染は 北米とヨーロッパで 何百万もの曝露と 何千もの死をもたらしました
科学分野:
- 環境科学
- 公衆衛生
- 大気化学
背景:
- 2023年にカナダで発生した極端な森林火災は,多くの地域で空気の質に重大な影響を及ぼしました.
- 野火の煙による粒子状物質 (PM2.5) の曝露は,人間の健康に重大な脅威をもたらします.
研究 の 目的:
- 2023年のカナダの野火に起因する世界的なおよび地域的なPM2.5曝露を定量化する.
- 急性および慢性的な死亡率を含む関連の人間の健康への影響を評価する.
主な方法:
- 衛星観測を利用して 煙突を監視した
- 機械学習アルゴリズムを用いて 曝露を評価する.
- PM2.5の分散と衝撃をシミュレートするために化学輸送モデルを適用しました.
主要な成果:
- 世界的な年間PM2.5曝露量は0.17μg/m3増加し,北米は最大の増加を記録した (1.08μg/m3).
- カナダの野火の煙は米国におけるPM2.5レベルに大きく寄与し,国内での野火の影響を上回る.
- 北米とヨーロッパで推定3億5400万人が感染し, 5,400人の急性死, 64,300人の慢性死がこれに関連しています.
結論:
- 2023年のカナダの野火は,PM2.5汚染の広範囲と深刻な健康被害を示した.
- 野火による大気汚染は,国境を越えた影響を及ぼす重大な公衆衛生上の負担となっています.
- 大規模な野火による健康被害を軽減するために 緊急の戦略が必要である.
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