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This article examines the association between daily levels of ambient air pollution and hospital visits for allergic diseases. Previous studies have typically used population-average exposure data, which may lead to biased effect estimates. In this study, individual exposure data was used to assess the effects of ambient air pollution on outpatient visits for allergic diseases. The results showed that increases in fine particulate matter (PM2.5) and ozone (O3) were associated with an increased risk of allergic diseases. Additionally, population-average exposure to PM2.5, particulate matter (PM10), O3, and sulphur dioxide (SO2) were also associated with an increased risk of allergic diseases. The study highlights the adverse effects of air pollution on allergic diseases and supports efforts to mitigate pollution and protect vulnerable individuals. [Extracted from the article]