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Four million cases of childhood asthma could be caused by air pollution from traffic - around 13% of those diagnosed each year, a global study suggests.
Current pollution guidelines may need changing because most children developing asthma live in areas within recommended levels, the authors say.
South Korea has the highest burden of pollution-related asthma, along with Chinese cities, the study found.
Experts say urgent action to protect children is required.
The study, in The Lancet Planetary Health journal, by researchers from George Washington University, looked at levels of nitrogen dioxide (NO2) as an indicator of traffic pollution.
NO2 is just one element of air pollution, which is also made up of particulate matter, ozone and carbon monoxide.
https://www.bbc.co.uk/news/health-47882038
Current pollution guidelines may need changing because most children developing asthma live in areas within recommended levels, the authors say.
South Korea has the highest burden of pollution-related asthma, along with Chinese cities, the study found.
Experts say urgent action to protect children is required.
The study, in The Lancet Planetary Health journal, by researchers from George Washington University, looked at levels of nitrogen dioxide (NO2) as an indicator of traffic pollution.
NO2 is just one element of air pollution, which is also made up of particulate matter, ozone and carbon monoxide.
https://www.bbc.co.uk/news/health-47882038