Many environmental risk factors have been associated with asthma development and morbidity in children, but a few stand out as well-replicated or that have a meta-analysis of several studies to support their direct association.Environmental tobacco smoke, especially maternal cigarette smoking, is associated with high risk of asthma prevalence and asthma morbidity, wheeze, and respiratory infections.Low air quality, from traffic pollution or high ozone levels, has been repeatedly associated with increased asthma morbidity and has a suggested association with asthma development that needs further research.
Recent studies show a relationship between exposure to air pollutants (e.g. from traffic) and childhood asthma.This research finds that both the occurrence of the disease and exacerbation of childhood asthma are affected by outdoor air pollutants.
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