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 recently discovered result of air pollution are seasonal “holes” in the ozone layer in the atmosphere above Antarctica and the Arctic, where 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.
Among new development has been growing problem of air pollution in Phnom Penh.I inked mainly to the rapidly increasing volume of traffic. At the moment, Phnom Penh and in other major urban areas is at an early stage and is largely uncontrolled. Cambodia appears to be facing growing air pollution challenge.
Even everyday levels of air pollution may insidiously affect health and behavior. Indoor air pollution is a problem in developing countries, where efficient insulation keeps pollutants inside the atructure.