Wildfire-Specific PM_2.5 Asthma Risk Across a Disproportionately Burdened Pediatric Population in Northern California

Area of Science:

• Environmental Health
• Pediatric Pulmonology
• Epidemiology

Background:

• Wildfire smoke events are increasing in severity, posing significant air pollution risks, particularly in the Western U.S.
• Children in disadvantaged communities, like Alameda and Contra Costa Counties, face disproportionate asthma-related health burdens from wildfire smoke.
• These counties have high asthma rates, making their pediatric populations especially vulnerable to air quality changes.

Purpose of the Study:

• To evaluate the association between wildfire-specific fine particulate matter (PM2.5) exposure and asthma-related hospital encounters in children.
• To assess short-term impacts of wildfire smoke exposure on pediatric asthma exacerbations.
• To identify if wildfire-related health risks are amplified in communities with pre-existing vulnerabilities.

Main Methods:

• Retrospective study analyzing data from January 2017 to February 2020 at a regional children's hospital.
• Utilized distributed lag quasi-Poisson regression models to assess impacts up to six days post-exposure.
• Modeled over 9,300 asthma-related hospital visits for children aged 0-18 years.

Main Results:

• Wildfire-specific PM2.5 exposure was associated with increased asthma-related hospital encounters in children.
• A 10 μg/m³ increase in wildfire PM2.5 correlated with a 4% rise in pediatric hospital encounters on the day of exposure.
• Cumulative exposure over five days showed a 13% increased risk, with amplified risks in vulnerable communities.

Conclusions:

• Wildfire smoke poses a quantifiable risk for pediatric asthma exacerbations, particularly in socioeconomically disadvantaged areas.
• Findings highlight the urgent need for targeted public health interventions in high-risk communities disproportionately affected by wildfire smoke.
• The study underscores the compounding effect of environmental pollution on existing community vulnerabilities.