https://www.selleckchem.com/products/gsk2334470.html Exposure to airborne fine particles with diameters ≤2.5 μm (PM ) pollution is a well-established cause of respiratory diseases in children; whether wildfire-specific PM causes more damage, however, remains uncertain. We examine the associations between wildfire-specific PM and pediatric respiratory health during the period 2011-2017 in San Diego County, California, and compare these results with other sources of PM . Visits to emergency and urgent care facilities of Rady's Children Hospital network in San Diego County, California, by individuals (aged ≤19 years) with ≥1 of the following respiratory conditions difficulty breathing, respiratory distress, wheezing, asthma, or cough were regressed on daily, community-level exposure to wildfire-specific PM and PM from ambient sources (eg, traffic emissions). A 10-unit increase in PM (from nonsmoke sources) was estimated to increase the number of admissions by 3.7% (95% confidence interval 1.2% to 6.1%). In contrast, the effect of PM attributable to wildfire was estimated to be a 30.0% (95% confidence interval 26.6% to 33.4%) increase in visits. Wildfire-specific PM was found to be ∼10 times more harmful on children's respiratory health than PM from other sources, particularly for children aged 0 to 5 years. Even relatively modest wildfires and associated PM resolved on our record produced major health impacts, particularly for younger children, in comparison with ambient PM . Wildfire-specific PM2.5 was found to be ∼10 times more harmful on children's respiratory health than PM2.5 from other sources, particularly for children aged 0 to 5 years. Even relatively modest wildfires and associated PM2.5 resolved on our record produced major health impacts, particularly for younger children, in comparison with ambient PM2.5. The coronavirus disease 2019 (COVID-19) pandemic has led to changes in health care use, including decreased emergency department visits for children. In