Effect modification by air pollutants
The associations of trees and allergenic trees definition 1 with higher
AR and asthma were stronger in the high tertile of NO2compared to the low tertile of NO2 (Figure 1). The same
holds for both definitions of allergenic trees and sensitization to
aeroallergens. The associations of trees with aeroallergen sensitization
and of allergenic trees definition 2 and food sensitization showed the
opposite tendency. The associations of trees and allergenic trees and AR
were stronger for the low ozone tertile compared to the high ozone
tertile, the same was observed for the association between allergenic
trees and aeroallergen sensitization (Figure E5).