The AQI is broken up into 5 distinct levels that are color coordinated. The last four levels have cautionary statements. On days when the ozone level is unhealthy for sensitive groups, an AQI of 101-150, active children and adults, and people with chronic heart and lung disease should limit prolonged outdoor exertion. On days when the ozone level is unhealthy, an AQI of 151-200, sensitive groups should avoid prolonged outdoor activities while everyone else should limit or restrict prolonged physical activity to early morning or evening since smog is increased in sunlight. When pollution levels are dangerous, an AQI of greater than 200, sensitive people should avoid all outdoor activities while everyone else should avoid prolonged outdoor exertion.
Air pollution can be a problem indoors, too.
Check your home for irritants that you can control like dust, household chemicals, and cigarette smoke. You may also want to test your home for the presence of the gas, radon, which is the second leading cause of lung cancer. Controlling and preventing lung disease needs everyone's attention. Learn to recognize the symptoms of lung disease, such as those described here. If you have any of these symptoms, see a doctor as soon as possible.