This is the best summary I could come up with:

An analysis has found that almost nine in 10 planned new school sites exceed three World Health Organization (WHO) targets on major air pollutants.

The study, published in the journal Archives of Disease in Childhood, suggests thousands of children enrolling at the new schools face a major threat to their health because of their greater susceptibility to the effects of air pollution.

The WHO global air quality guidelines (AQG) set out numerical targets for annual exposure to major pollutants, including small particulate matter (PM2.5, PM10) and nitrogen dioxide (NO2).

Pollutant levels were particularly high at sites in London, Birmingham, Manchester and Leeds, while those in other large cities, including Liverpool, Bristol and Newcastle, were relatively low.

The researchers acknowledged that they used annual averages to estimate air pollution levels at the new school sites, and that more granular data, incorporating different times of day and seasonality, would provide a more detailed picture.

“Unless current recommendations are replaced with mandatory standards, it is unlikely that those proposing or designing new schools will make these assessments unless there is an individual already involved in the process who is both well-informed and passionate about reducing the impact of pollution.”

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