Association between traffic-related air pollution and risk of outpatient visits for dry eye disease in a megacity along the subtropical coast in South China.

BMC Public Health

Department of Ophthalmology, Guangdong Eye Institute, Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, 106 Zhongshan Er Road, Guangzhou, 510080, Guangdong, PR China.

Published: January 2025

Background: Traffic-related air pollution especially in highly socioeconomically developed megacity is usually considered as a severe problem leading to inevitable adverse health outcomes. This study aimed to investigate the associations between traffic-related air pollutants with risk of dry eye disease (DED) outpatient visits in a megacity (Guangzhou) along the subtropical coast in South China.

Methods: Daily data on DED outpatient visits and environmental variables from 1 January 2014 to 31 December 2020 in Guangzhou were obtained. A time-series study using a quasi-Poisson generalized linear model (GLM) combined with distributed lag non-linear model (DLNM) was adopted. Subgroup analyses stratified by age, gender, and season were conducted.

Results: Totally, 27, 828 DED cases were identified during the study period including 2557 days. Daily number of outpatient visits for DED ranged from 0 to 41. An increase of 10 μg/m in PM, NO and SO concentration was associated with 3.1%, 5.9% and 17.4% increase in the risk of DED outpatient visits, respectively (RR = 1.031, 95%CI: 1.004-1.059, lag 0-11 day; RR = 1.059, 95% CI: 1.027-1.092, lag0-14 day; RR = 1.174, 95% CI: 1.036-1.330, lag0-13 day). Subgroup analyses indicated that the effects of PM exposure on the risk of DED outpatient visits remained significant in aged < 60 years (RR  = 1.008, 95% CI: 1.003-1.013, lag0 day) and the effects of SO exposure on the DED outpatient visits risk remained significant in the females (RR  = 1.025, 95% CI: 1.006-1.044, lag0 day). The associations of PM (RR = 1.010, 95% CI: 1.003-1.016, lag0 day) and SO (RR = 1.030, 95% CI: 1.003-1.058, lag14 day) exposure with DED outpatient visits risk remained significant in warm seasons, whereas NO (RR = 1.006, 95% CI: 1.002-1.009, lag14 day) exposure was significantly associated with DED outpatient visits in cold seasons. The associations of PM (first visit, RR = 1.006, 95% CI: 1.001-1.011, lag0 day; re-visit, RR = 1.002, 95% CI: 1.000-1.005, lag6 day), NO (first visit, RR = 1.006, 95% CI: 1.001-1.012, lag0 day; re-visit, RR = 1.007, 95% CI: 1.002-1.012, lag0 day), and SO (first visit, RR = 1.023, 95% CI: 1.002-1.044, lag0 day; re-visit, RR = 1.023, 95% CI: 1.000-1.045, lag0 day) exposure with risk of DED outpatient visits were significant for both first- and re-visits.

Conclusions: Our study revealed that short-term exposure to PM, NO and SO were positively associated with risk of DED outpatient visits, especially for the youngers, females and during warm seasons, providing evidence for making public health policy to improve life quality in developed megacity.

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http://dx.doi.org/10.1186/s12889-025-21319-0DOI Listing

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