Air pollution harms humans. It causes health problems such as burning eyes and nose. There is also ore serious health problems that it can cause some chemicals can cause cancer, birth defects, brain, and nerve damage. Air pollution damages the ozone layer that protects us from the harmful ultraviolet rays from the sun. Air pollution also effects plants it interferes with photosynthesis so the plants can not properly make their own food. It affects the fruits the plants grow and make them smaller and less nutritious.
Air pollution may possibly harm populations in ways so subtle or slow that they have not yet been detected. For that reason research is now under way to assess the long-term effects of chronic exposure to low levels of air pollution—what most people experience—as well as to determine how air pollutants interact with one another in the body and with physical factors such as nutrition, stress, alcohol, cigarette smoking, and common medicines. Another subject of investigation is the relation of air pollution to cancer, birth defects, and genetic mutations.
.A relatively recently discovered result of air pollution are seasonal "holes" in the ozone layer in the atmosphere above Antarctica and the Arctic, coupled with growing evidence of global ozone depletion. This can increase the amount of ultraviolet radiation reaching the earth, where it damages crops and plants and can lead to skin cancer and cataracts.