Outdoor TriggersAir pollution can trigger your child's asthma. Even healthy people can have trouble breathing on high air pollution days. The main air pollution triggers are small particles (also known as particulate pollution) and ozone. These come from smoke, road dust, and emissions from cars, factories and power plants. In general, ozone levels are highest in the summer, but levels of particle pollution can be high any time of year and are higher near busy roads and where people burn wood.
Asthma attacks can occur the same day, but may also occur the day AFTER outdoor pollution levels are high. When the Air Quality Index (AQI) reports unhealthy levels, limit physical exertion outdoors.
What you can do
Exposure to diesel exhaust fumes may make asthma symptoms worse. EPA’s Clean School Bus Program helps reduce pollution from school buses.
Learn more at www.epa.gov/cleanschoolbus.