A new analysis of 18 rodent studies suggests that air pollution exposure may worsen allergic rhinitis, a common condition that causes sneezing, a runny or stuffy nose, and itchy eyes. The review looked at how air pollution affects markers of type 2 inflammation, which is a key driver of allergic responses. In the animals, exposure to air pollution increased levels of eosinophils (a type of white blood cell) and several inflammatory proteins, including IL-4, IL-5, and IL-13. It also raised levels of OVA-specific IgE, an antibody linked to allergies. At the same time, it reduced ZO-1, a protein that helps keep the nasal lining healthy, and increased other inflammatory markers like NLRP3 and IL-1β. These changes suggest that air pollution might make allergic rhinitis worse by ramping up inflammation and damaging the nasal barrier.
However, this evidence comes from animal studies, not human trials. The findings are not definitive because the studies varied widely, and the analysis did not report exact numbers or statistical details. Also, the review did not look at other potential mechanisms or report any safety concerns. So, while the link is plausible, we cannot say for sure that air pollution causes these effects in people.
For everyday readers, the takeaway is that reducing exposure to air pollution might help manage allergic rhinitis symptoms, but this is not proven. If you have allergic rhinitis and are concerned about air quality, talk to your doctor about ways to minimize exposure and manage your symptoms.
