Breathing polluted air is unhealthy. For example, you might find it more difficult to breathe, you might cough or your chest might feel tight. Two main types of air pollution are ozone pollution and particle pollution. The ozone we breathe at ground level is bad. But very high in the atmosphere (the stratosphere) is a natural layer of ozone that is good because it helps protect us from the sun’s harmful ultraviolet rays. A rhyme that can help you remember this is “Ozone: Good up high, bad nearby.” Both people’s activities (such as transportation, energy use, and materials production) and nature (such.
