未出生的胎儿也受到空气污染的威胁。多项研究表明，长期处于颗粒物浓度较高的环境中会提高流产、早产和生育率下降的几率。

Unborn children are also at risk. Studies show chronic exposure to high levels of particulate matter is associated with high rates of fetal loss, premature births and lower birthrates.

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颗粒物浓度监测不仅是评价城市空气质量的基础，而且是进行城市污染控制与环境健康效应评估的重要依据。

Monitoring of particulate matter concentration is the basis for urban air quality evaluation and pollution control, and also very important for health effects assessment.

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