Environmental Public Health Tracking

The environmental hazard and health outcome shown in this map are not necessarily related. Some, but not all, environmental hazards are currently known or suspected to affect human health. For more information, see the EPHT FAQs on Map Displays.
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Asthma is a chronic disease of the lungs in which the airways get narrow and fill with secretions, causing difficulty breathing. People with asthma have shortness of breath, chest tightness, wheezing, and cough, which can be serious or even fatal if not treated. Asthma attacks can be treated effectively and asthma attacks can be prevented by a combination of medication and avoidance of triggers. These triggers include allergens from animals and pests, fine particles (PM2.5), ozone, tobacco smoke, exercise, and stress. Pay attention to the daily Air Quality Index and follow the advice to limit physical activity outdoors on yellow, orange, and red days. For more information, see the MTN Topics Pages on asthma