Air Pollution and Childhood Respiratory Allergies
A study in the United States suggests that childhood respiratory allergies, which contribute to missed school days and other activity limitations, have increased in recent years, possibly due to environmental factors.
The study examined the associations between the reporting of respiratory allergy or hay fever and annual average exposure to particulate matter ? 2.5 µm in diameter (PM2.5), PM ? 10 µm in diameter, sulfur dioxide, and nitrogen dioxide and summer exposure to ozone.
Results showed that increased respiratory allergy/hay fever was associated with increased summer ozone levels and increased PM2.5.
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