How nitrogen air pollution can increase the frequency and impact of pollen allergies — Credit: This article is based on the scientific article “Impact of environmental nitrogen pollution on pollen allergy: A scoping review” by Paulien Verscheure, Olivier Honnay, Niko Speybroeck, Robin Daelemans, Nicolas Bruffaerts, Brecht Devleesschauwer, Tobias Ceulemans, Laura Van Gerven, Raf Aerts, and Rik Schrijvers. …