Wildfire smoke is emerging as a serious public health threat, especially for children with asthma. As wildfires grow more frequent and intense, their effects are no longer limited to nearby burn zones. Smoke can travel hundreds of miles, carrying harmful air pollutants into cities, suburbs, and rural communities far from the flames. New research shows that this smoke exposure is linked to poorer asthma control in children and adolescents, raising important concerns for families, healthcare providers, and policymakers.
A recent study published in Environmental Health in December 2025 found that pediatric asthma control worsened during a summer heavily affected by wildfire smoke compared with a previous year that had minimal smoke exposure. The findings highlight the growing connection between air pollution from wildfires and respiratory health in children, even in regions not traditionally considered high risk for wildfires.
This article explores how wildfire smoke affects pediatric asthma, what the latest research reveals, and what families can do to reduce risks and protect children’s lung health.
Asthma is one of the most common chronic conditions in children. It affects millions of children worldwide and is a leading cause of missed school days and emergency room visits. Asthma causes inflammation and narrowing of the airways, leading to symptoms such as wheezing, coughing, chest tightness, and shortness of breath.
For many children, asthma symptoms can be controlled with proper medication and trigger management. However, environmental factors play a major role in asthma flare-ups. Common asthma triggers include pollen, dust mites, mold, cold air, respiratory infections, and air pollution.
Air pollution is particularly concerning because it is often unavoidable. Unlike indoor allergens, outdoor air quality affects entire communities. Wildfire smoke has become one of the most dangerous and unpredictable forms of air pollution affecting children with asthma today.
Wildfire smoke is a complex mixture of gases and microscopic particles released when trees, plants, and other materials burn. One of the most harmful components of wildfire smoke is fine particulate matter known as PM2.5. These particles are extremely small and can penetrate deep into the lungs and even enter the bloodstream.
For children with asthma, PM2.5 exposure can trigger airway inflammation, increase mucus production, and cause bronchoconstriction. This can result in more frequent asthma symptoms, increased use of rescue inhalers, and a higher risk of asthma attacks.
Children are especially vulnerable to wildfire smoke for several reasons. Their lungs are still developing, they breathe more air relative to their body weight than adults, and they often spend more time outdoors. These factors make wildfire smoke a significant risk to pediatric respiratory health.
The study that brought renewed attention to this issue was conducted by researchers from the University of Vermont. Led by Anna K. Maassel, the research team analyzed electronic health record data from children and young adults aged 3 to 21 years who had been diagnosed with asthma.
The study focused on patients in Vermont and Upstate New York, regions that experienced noticeable wildfire smoke during the summer of 2023 due to large wildfires burning in Canada. Researchers compared asthma control during three different summers:
The researchers used three clinical measures of asthma control to assess how well children’s asthma was managed during these periods. They also controlled for pollen exposure to reduce the influence of seasonal allergies on asthma symptoms. ZIP code level PM2.5 data was used to estimate smoke exposure.
In total, 1,217 clinical encounters were included in the analysis, making this one of the more robust real world studies examining wildfire smoke and pediatric asthma.
The study found that asthma control was significantly worse during the smoke affected summer of 2023 compared with the summer of 2022 for two of the three clinical measures. This indicates that wildfire smoke exposure was associated with meaningful declines in asthma control among children.
When researchers compared the summer of 2023 with the summer of 2024, they did not find significant differences in asthma control. This suggests that asthma outcomes may fluctuate year to year based on multiple factors, but the clear contrast between 2023 and 2022 points to wildfire smoke as an important contributor.
Interestingly, the study did not find a direct association between ZIP code level PM2.5 values and asthma control within the summer of 2023. This does not mean smoke was harmless. Instead, it highlights limitations in exposure measurement. ZIP code level data may not capture individual behavior, indoor air quality, or time spent outside the home.
According to study coauthor Keith J. Robinson from the University of Vermont Larner College of Medicine, the findings suggest that wildfire smoke, even when originating hundreds of miles away, has the potential to negatively impact children’s health.
One of the most important takeaways from this research is that proximity to wildfires is no longer the only concern. During the summer of 2023, smoke from Canadian wildfires affected large portions of the northeastern United States, including areas that rarely experience local wildfires.
This long range smoke transport means that families who have never considered wildfire smoke a risk may now face repeated exposure. Urban areas, suburban communities, and even rural regions far from fire zones can experience days or weeks of poor air quality.
For children with asthma, this creates a new and growing health challenge. It also underscores the need for nationwide public health strategies rather than regional responses alone.
For parents of children with asthma, wildfire smoke should be treated as a serious asthma trigger, similar to pollen or respiratory infections. Awareness and preparation are key to reducing risks.
Parents should monitor daily air quality indexes, especially during wildfire season. On days when air quality is poor, children should limit outdoor activities, particularly strenuous exercise. Keeping windows and doors closed and using air purifiers with HEPA filters can help improve indoor air quality.
Children with asthma should have an up to date asthma action plan that includes steps to take during periods of smoke exposure. This may involve adjusting medication use or increasing monitoring of symptoms. Rescue inhalers should always be readily available.
Parents should also watch for early signs of worsening asthma, such as increased coughing at night, wheezing, or shortness of breath during normal activities. Prompt action can help prevent severe asthma attacks.
Healthcare providers play a critical role in addressing the impact of wildfire smoke on pediatric asthma. Clinicians can educate families about smoke exposure risks, review asthma action plans before wildfire season, and emphasize the importance of medication adherence.
Public health agencies also have a responsibility to provide timely and clear information about air quality. School policies regarding outdoor activities during smoke events, access to clean indoor air spaces, and community wide alerts can all help reduce exposure for vulnerable children.
As wildfires become more common, integrating air quality considerations into asthma management guidelines may become increasingly necessary.
Climate change is expected to increase the frequency, duration, and intensity of wildfires in many parts of the world. This means that wildfire smoke exposure is likely to become a recurring public health issue rather than an occasional emergency.
The study published in Environmental Health adds to growing evidence that wildfire smoke has real consequences for children with asthma. More research is needed to understand long term effects, identify the most effective protective strategies, and improve exposure measurement.
Protecting children’s respiratory health in a changing climate will require coordinated efforts across healthcare, public health, and environmental policy. Clean air is not only an environmental goal but a critical foundation for healthy childhood development.
Maassel AK, Robinson KJ, et al. “Wildfire Smoke Exposure and Pediatric Asthma Control.” Environmental Health. Published online December 11, 2025.
This content is for informational and educational purposes only and is not intended as medical advice, diagnosis, or treatment. Asthma severity and triggers vary between individuals. Always consult a qualified healthcare professional for personalized medical guidance regarding asthma management or respiratory health concerns.
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