锻炼减少了污染空气中的死亡和癌症风险,当PM2.5超过25微克/立方米时,其惠益急剧下降。 Exercise reduces death and cancer risk less in polluted air, with benefits dropping sharply when PM2.5 exceeds 25 μg/m³.

一项重大的国际研究发现,长期接触微粒污染(PM2.5)会削弱锻炼对健康的好处,在污染严重地区,对死亡和癌症的保护作用会减少。 A major international study finds that long-term exposure to fine particulate pollution (PM2.5) weakens the health benefits of exercise, with protective effects against death and cancer diminishing in areas with high pollution. 研究人员分析了来自五个国家150多万成年人的数据,发现虽然在清洁空气中将死亡风险降低30%,但当PM2.5含量超过25微克/立方米时,这一数字下降到12-15 % , 世界人口几乎有一半超过这一水平。 Analyzing data from over 1.5 million adults across five countries, researchers found that while exercise lowers death risk by 30% in clean air, this drops to 12–15% when PM2.5 levels exceed 25 μg/m³—levels surpassed by nearly half the world’s population. 35微克/立方米以上,癌症预防的好处几乎消失。 Above 35 μg/m³, the benefit for cancer prevention nearly vanishes. 虽然即使在受污染地区,演习也是有益的,但专家们敦促改善空气质量,并建议检查污染程度,选择更清洁的路线,或减少高污染日的强度。 Though exercise remains helpful even in polluted areas, experts urge improving air quality and suggest checking pollution levels, choosing cleaner routes, or reducing intensity on high-pollution days.