Air pollution can affect your health and the environment. There are actions every one of us can take to reduce air pollution and keep the air cleaner, and precautionary measures you can take to protect your health. No health impacts are expected when air quality is in this range. Moderate 51-100 Unusually sensitive people should consider limiting prolonged outdoor exertion. Unhealthy for Sensitive Groups 101-150 Active children and adults, and people with respiratory disease, such as asthma, should limit prolonged outdoor exertion.
Ozone is a major element of urban smog.
Ozone can limit the ability to take a deep breath, and it can cause coughing, throat irritation, and breathing discomfort. Even healthy adults involved in moderate or strenuous outdoor activities can e xperience the unhealthy effects of ozone. Ozone is a colorless gas that can be found in the air we breathe. Each molecule of ozone is composed of three atoms of oxygen, one more than the oxygen molecule we need to breathe to sustain life. The additional oxygen atom makes ozone extremely reactive.