Protecting Your Health on High Pollution Days

Poor air quality events are becoming more frequent due to climate change, wildfire activity, and urban growth. Knowing how to protect yourself during these events can significantly reduce your risk of both immediate health effects and long-term damage. ## Who Is Most Vulnerable **Children:** Their lungs are still developing, they breathe more air per pound of body weight than adults, and they spend more time outdoors. Children with asthma face particular risk during poor air quality events. **Older adults (65+):** Age-related decline in lung function and higher rates of heart and lung disease make older adults more susceptible to air pollution effects. The elderly are also more likely to take medications that may increase vulnerability. **Pregnant women:** Air pollution exposure during pregnancy is linked to preterm birth, low birth weight, and potentially developmental issues. The developing fetus is particularly vulnerable during the first and third trimesters. **Outdoor workers:** Construction workers, landscapers, agricultural workers, delivery drivers, and others who work outdoors face prolonged exposure that indoor workers can avoid. OSHA provides specific guidance for worker protection during poor air quality events. **People with chronic conditions:** Those with asthma, COPD, heart disease, diabetes, and other chronic conditions face amplified risks from air pollution. Even conditions not obviously related to breathing — like diabetes and heart disease — increase vulnerability to air pollution effects. ## Immediate Actions for High AQI Days **Check AQI before going outside:** Make it a daily habit to check AirNow.gov or your weather app's AQI reading before planning outdoor activities. When AQI exceeds 100, sensitive groups should take precautions. Above 150, everyone should limit outdoor exposure. **Reduce physical exertion outdoors:** Exercise increases your breathing rate, which increases the volume of polluted air entering your lungs. Move workouts indoors, reduce intensity, or reschedule for early morning hours when AQI is typically lowest. **Create clean indoor air:** Close windows and external doors. Run HEPA air purifiers in occupied rooms. Set HVAC systems to recirculate (not fresh air) mode. Avoid activities that create indoor pollutants — skip the gas stove, candles, incense, and vacuum cleaning which stirs up settled particles. **Use appropriate masks outdoors:** N95 or KN95 respirators filter fine particulate matter effectively when properly fitted. Replace masks when they become damp or after 40 hours of use. Cloth and surgical masks provide minimal protection against PM2.5. ## Setting Up Your Home for Air Quality Events **HEPA air purifiers:** Every home should have at least one portable HEPA purifier for the primary sleeping area. Size the unit for the room's square footage. Run it on high during smoke events and medium for daily filtration. Change filters per manufacturer schedule. **HVAC upgrades:** Upgrade your furnace filter to MERV-13 or higher. These filters capture PM2.5 particles while still allowing adequate airflow. If your HVAC system cannot accommodate high-MERV filters, use the highest rated filter your system can handle without reducing airflow. **Sealing your home:** Weather-strip doors and windows. Seal gaps around plumbing and electrical penetrations. During severe events, use painter's tape and plastic sheeting over windows and doors you will not be using. A well-sealed home can maintain indoor PM2.5 levels 50-80% below outdoor levels. **DIY air purifier:** In an emergency, tape a MERV-13 furnace filter to the back of a box fan. This "Corsi-Rosenthal box" can significantly reduce indoor PM2.5 levels and can be built in minutes with materials from any hardware store. ## Long-Term Health Strategies **Know your baseline:** Establish your baseline lung function with a pulmonary function test (spirometry). This gives you a reference point for detecting air-pollution-related changes over time. People living in high-pollution areas should consider annual testing. **Build respiratory resilience:** Regular cardiovascular exercise (in clean air) strengthens respiratory function and helps your body cope with occasional pollution exposure. Maintaining a healthy weight reduces respiratory strain. **Anti-inflammatory diet:** Diets rich in antioxidants (fruits, vegetables, omega-3 fatty acids) may help mitigate some inflammatory effects of air pollution. Vitamins C and E have shown protective effects in some studies. **Medical preparedness:** If you have asthma or COPD, ensure your action plan is current and your rescue medications are filled and accessible. Discuss preemptive medication adjustments with your doctor before anticipated poor air quality periods. **Location choices:** If you are choosing where to live, consider historical air quality data as a health factor. The difference between a city with 200 Good AQI days per year and one with 100 can translate to meaningful differences in long-term health outcomes. ## Special Considerations for Parents Children cannot always advocate for themselves during poor air quality events. Schools should have indoor recess and PE policies triggered by AQI thresholds. Parents should communicate with schools about their child's sensitivity and ensure asthma action plans are on file. Infants and toddlers should be kept indoors during high AQI events. Baby carriers and strollers place children closer to vehicle exhaust level on streets. Avoid walking with children along busy roads during rush hour. Teach older children to recognize air quality symptoms — coughing, chest tightness, eye irritation — and to move indoors if they experience them during outdoor play.