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Recent studies have revealed the influence of fine particulate matter (PM 2.5 ) on increased medication use, hospital admission, and emergency room visits for asthma attack in children, but the lagged influence of PM 2.5 on children&amp;rsquo;s asthma and geographic disparities of children&amp;rsquo;s asthma have rarely been discussed simultaneously. This study investigated the documented diagnosis of children&amp;rsquo;s asthma in clinic visits for children aged less than 15 years old that were associated with PM 2.5 in two counties located in west-central Taiwan during 2005⁻2010. The result shows that PM 2.5 had a significant lagged effect on children&amp;rsquo;s asthma for up to 6 days. A significantly higher relative risk for children&amp;rsquo;s asthma was more likely to happen at 2-day lag compared to the present day when PM 2.5 increased from 36.17 &amp;mu;g/m³ to 81.26 &amp;mu;g/m³. Considering all lagged effects, the highest relative risk for children&amp;rsquo;s asthma was 1.08 (95% CI = 1.05, 1.11) as PM 2.5 increased as high as 64.66 &amp;mu;g/m³. In addition, geographic disparities of children&amp;rsquo;s asthma were significant, and 47.83% of areas were identified to have children vulnerable to asthma. To sum up, our findings can serve as a valuable reference for the implementation of an early warning to governmental agencies about a susceptible population of children.

Lagged Influence of Fine Particulate Matter and Geographic Disparities on Clinic Visits for Children’s Asthma in Taiwan