air quality

Poor air quality in cities is responsible for millions of premature deaths globally each year.城市糟糕的空气质量是全球每年数百万人过早死亡的原因。

Real-time air quality monitoring allows authorities to issue health advisories when pollution levels are dangerous.实时空气质量监测使当局能够在污染水平达到危险程度时发布健康预警。