Air pollutants could boost potency of common airborne allergens -- ScienceDaily

A pair of air pollutants linked to climate change could also be major
contributors to the unparalleled rise in the number of people sneezing,
sniffling and wheezing during allergy season. The gases, nitrogen
dioxide and ground-level ozone, appear to provoke chemical changes in
certain airborne allergens that may increase their potency. That, in
combination with changes in global climate could help explain why
allergies are becoming more common.

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