Her monitor has shown that air pollution levels are higher closer to ground level, which has helped highlight concerns that babies and young kids may be at higher risk of developing lung problems.

她的监测仪显示，越是接近地面，空气污染水平越高。这凸显了人们的担忧，担心婴儿和幼童患肺部疾病的风险可能会增加。

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Thee average air pollution level for cities around the globe is 22 micrograms per cubic metre, according to the World Health Organisation (WHO).

据世界卫生组织（WHO）称，全球城市空气污染平均水平在22微克/立方米。

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Air pollution has risen above an acceptable level.

空气污染已经超标。

《牛津词典》

Prof Kevin McConway, a statistician at the Open University said, based on the findings, if Newcastle were to halve its current particulate air pollution level it would lead to two or three fewer low weight babies out of the total 3, 500 or so born in the city each year.

BBC: Traffic fumes linked to lower birth weight

The level of air pollution caused by vehicles across Sheffield is being monitored at sites across the city.

BBC: Traffic pollution tested across Sheffield

Outdoor air pollution is at its lowest level in 30 years.

CNN: Challenges ahead for a changing Earth