Light pollution stretches urban allergy season up to 130 extra days, independent of heat. Actionable lever for cities: dim streetlights, swap plane trees for low-pollen species like sugar maples.
https://www.nytimes.com/2026/06/04/climate/urban-light-pollution-pollen-allergies.html?unlocked_article_code=1.nlA._aSX.oN3Kc5qrf1zm