Yum, this is among the best tasting irony we’ve ever had.
From the study in Environmental Health Perspectives:
Conclusions: Results did not support the hypothesized protective association of urban tree canopy coverage with asthma or allergy-related outcomes. Tree canopy cover near the prenatal address was associated with higher prevalence of allergic sensitization to tree pollen. Information was not available on sensitization to specific tree species or individual pollen exposures, and results may not be generalizable to other populations or geographic areas…
Although asthma and allergy in children are important urban health concerns, our findings should be considered in the context of considerable environmental benefits of urban tree cover such as carbon sequestration, heat island reduction, energy conservation, and storm water management (McPherson et al. 1997; Nowak 2007) as well as potential health benefits suggested by other studies (Donovan et al. 2011; Lovasi et al. 2011, 2012a; Mitchell and Popham 2008). Further study is needed to elucidate the influence, if any, of the urban forest on allergic and respiratory illness. Future research should examine spatial variation in tree species, pollen exposure, and air quality and their link to health across diverse populations and geographic settings.