Air pollution is the presence of one or more physical substance , chemistry , or biology in theatmosphere in a quantity that can harm humans , animals , and plants , to disturb æstheticsand comfort , or destructive to property . Air pollution could be caused by natural or sourcesof human activities . A physical disturbance such as definitions some pollution sound , heat ,radiation or pollution light is regarded as air pollution . The nature of air pollution resulting inthe impact can be direct and local , regional , as well as global scale . A substance containedin the air pollutants can enter into the body through the respiratory system . A contaminantaway penetration into the body depends on the kind of pollution . Particulate undersizedbesar can be stuck in the upper respiratory tract , while the particulates undersized smalland gas can reach the lungs . Of the lungs , a contaminant absorbed olehsistem circulatoryand spread throughout the body .