Every day, millions of children breathe air that can impact their health, development, and ability to learn. According to the World Health Organization (WHO), approximately 93% of children under age 15 were exposed to air pollution levels above its air quality guidelines in data reported in 2018 (1). This exposure can affect lung development, respiratory health, and cognitive ability during critical stages of childhood.
Children are especially vulnerable to air pollution because their lungs and brains are still developing. From busy roads and industrial emissions to secondhand smoke inside homes and classrooms, air pollution can follow children throughout the day, affecting their health and well-being.
Understanding where pollution comes from, how it affects children, and what families and educators can do to reduce exposure can lead to healthier childhoods.
How air quality affects child health
Clean air is critical for healthy childhood development. When children breathe polluted air, they may inhale fine particles and gases that irritate their respiratory systems, trigger inflammation, and contribute to both immediate and long-term health problems.
The WHO has linked air pollution exposure in children to respiratory infections, asthma, impaired lung development, adverse effects on brain development, and other health outcomes. The severity of these effects depends on factors such as the type and concentration of pollutants, the duration of exposure, and a child's health and developmental stage (2).
Cognitive and mental development
Brain development is especially active during childhood as children begin to form basic learning structures and building blocks.
Researchers and scientists increasingly associate exposure to air pollution with shifts in children's cognitive and neurological development. A 2016 study found heightened neuroinflammation when children experienced air pollution exposure, causing damage to neural tissue and reduced blood flow. Researchers in the study also discovered the presence of protein characteristics related to Alzheimer’s disease in children with high pollutant exposure levels (3).
Air quality also influences children's concentration and school performance. A 2024 University of Southern California study linked regional air pollution to poor memory and learning performance in 9- and 10-year-olds (4). Most of the child participants in the study experienced pollutant exposure from agricultural emissions and ultrafine particulate matter, such as PM2.5.
Lung and respiratory health
Children's lungs continue developing throughout childhood and adolescence, making them particularly susceptible to airborne irritants and fine particulate matter.
Airborne pollutants can have adverse respiratory effects ranging from short-term symptoms to long-term chronic risks. A 2023 research study found that children experiencing prolonged pollutant exposure can have heightened risks for asthma and pneumonia (5). The study also highlighted reduced lung functions and decreased respiratory growth, which can be especially impactful for children with pre-existing medical conditions or allergen sensitivities.
Repeated exposure during childhood can affect healthy lung development, making the prevention of avoidable exposure especially pivotal.
Heart health and general development
Although respiratory effects are among the most recognizable consequences of air pollution, its effects are not limited to the lungs. Fine particles can contribute to inflammation and other processes that cause cardiovascular problems, hospital visits, and missed school days.
Air pollution affects more than just the lungs or cognitive development. Recent studies have linked long-term air pollution with elevated blood pressure in children. Childhood high blood pressure is a risk factor for hypertension and heart disease in adulthood (6).
According to the European Environmental Agency, children can also be more susceptible to regional air pollution, causing an increase in hospitalizations and emergency room visits from short-term exposures (7). These increased hospital visits can be caused by exacerbated allergen symptoms or concentration difficulties from lingering airborne pollutants.
How kids are exposed to air pollution
Air pollution is often associated with outdoor smog, busy roads, and industrial emissions. However, exposure does not end when children walk through the front door of their homes or enter their classrooms.
Outdoor pollution entering indoor spaces
Children attending schools near highways, busy roads, industrial areas, or wildfire-prone regions may experience elevated exposure to airborne particles and gases. Vehicle exhaust and construction activity can contribute to outdoor pollution that subsequently enters indoor spaces through open vents, doors, and windows.
Schools located in different environments may face different challenges. Schools built near major roadways are exposed to traffic-related pollution, while schools in regions affected by seasonal wildfires need to plan for smoke events. Without appropriate precautions, these pollutants can enter classrooms and compromise student and faculty health.
Indoor pollution at home and school
Indoor environments can contain a mixture of airborne pollutants and ultrafine particles. Dust, pollen, pet dander, mold spores, and other biological contaminants may aggravate allergies and asthma. Even children without pets in the household can be affected by cat allergens, as allergens are often carried from home to school on clothes (8).
Volatile organic compounds (VOCs), which can be released by paints, adhesives, furnishings, cleaning products, and other materials, may also affect indoor air quality.
Secondhand tobacco smoke is another preventable source of exposure. Children living in homes where smoking occurs face increased risks of respiratory infections, ear infections, reduced lung function, and more frequent or severe asthma symptoms. Smoke can also travel between rooms and linger on surfaces and materials, extending exposure beyond the immediate smoking area.
Crowded classrooms introduce additional considerations. Respiratory viruses and airborne bacteria can spread through the air, particularly in poorly ventilated indoor spaces.
Pollutants to watch for child safety
Air pollution consists of different particles and gases, each with its own sources and potential health risks. Identifying the pollutants that may be present in a child's environment helps families and schools choose appropriate ways to reduce exposure.
Some of the most common airborne pollutants include:
- Nitrogen dioxide (NO₂)
- Volatile organic compounds (VOCs)
- Secondhand smoke
- Mold spores
- Viruses and bacteria
- Allergens
- PM2.5, particulate matter measuring 2.5 microns in diameter or less
- PM10, particulate matter measuring 10 microns in diameter or less
Many of these airborne pollutants, like PM2.5, can be microscopic or invisible to the naked eye, causing unexpected exposure for children.
Air quality awareness and education for children
Protecting kids from air pollution involves more than improving the air around them. Air quality education can introduce environmental health concepts in ways that suit different ages and lets children experience hands-on learning.
Air quality monitoring provides a practical way to bring these lessons to life through data collection methods students can see. Indoor and outdoor air quality monitoring provides access to real-time and historical air quality information, helping students and educators observe changes in pollution levels to connect them with local environmental conditions and air pollution sources.
Whether a school is in Louisiana, Cameroon, or Thailand, students with access to monitors can use air quality data to explore patterns, discuss potential pollution sources, and consider ways to reduce exposure.
The Schools4Earth program supports this approach by helping schools establish outdoor air quality monitoring. Schools4Earth is an air quality program dedicated to providing accessible data and advanced air monitoring to underserved schools. Educators can receive real-time pollution information and share air quality data to engage clean air learning within their communities. The program also creates opportunities for students to contribute to a wider network of environmental monitoring and learning.
By combining air quality education with real-world data, schools can help students become informed participants in environmental health. Children can learn not only how to protect themselves, but also how communities can work together to support cleaner air for everyone.
More ways to protect kids from air pollution
Improving children's air quality depends on action at home, at school, and across the wider community. Parents and educators can take practical steps to reduce exposure, while monitoring and filtration tools can help identify problems and support clean air decisions.
What families can do
Children rely on clean air at home for safe and comfortable breathing spaces. Parents and caregivers can improve air quality at home through daily practices and monitoring, such as:
- Maintaining smoke-free indoor environments.
- Checking air quality through indoor and outdoor air monitors when planning daily activities.
- Utilizing ultrafine air filtration to actively clean and refresh indoor air spaces.
- Limiting the use of aerosol cleaning products and candles.
- Voicing air quality concerns and clean air education at school board meetings.
- Supporting clean air initiatives and local pollutant monitoring.
What schools can do
As students spend hours inside classrooms, schools can take steps to create healthier schools, such as:
- Joining the Schools4Earth program.
- Checking air quality through indoor and outdoor air monitors when planning daily activities.
- Utilizing HVAC-based air purifiers throughout the school for dual filtration and ventilation.
- Developing an air quality response plan for active school days.
- Limiting the usage of aerosol cleaning sprays and candles in enclosed spaces.
- Integrating air quality and airborne pollutant activity into lesson plans and daily learning.
- Initiating school fundraisers or clean air campaigns to spread awareness.
- Joining the Clean Air School program to create tailored clean air solutions.
- Applying for grants. Schools in socioeconomically disadvantaged communities may qualify for assistance through The Foundation for Clean Air.
When parents, educators, school administrators, and communities work together, they can reduce preventable exposure and help create healthier spaces for children to learn and grow.
Conclusion
Every child deserves to learn, play, and grow in an environment that supports their health. Yet air pollution remains a widespread threat, affecting children in their homes, classrooms, and communities. Because their lungs and immune systems are still developing, children are particularly vulnerable to the consequences of polluted air.
The solution begins with awareness. Parents can create healthier homes and educators can improve classroom air quality through innovative filtration and monitoring devices. Air quality monitors can help communities understand local conditions, while Schools4Earth offers a way for schools to participate in monitoring and environmental education.
Clean air should never be a privilege. It should be a priority. By working together, families, schools, and communities can help protect children's health today and build a healthier future for generations to come.
