Pollution - Essay Example By steps taken for eliminating toxic substances from production process and by diminishing production of harmful materials people can safeguard the environment and human health. Different forms of pollution Air pollution Air pollution can be caused when pollutants like carbon monoxide, hydrocarbons, oxides of sulphur and nitrogen and also materials like dust, smoke and compounds of lead are emitted directly into the atmosphere. Global warming is caused by greenhouse gases like carbon dioxide (49% to 55%), chlorofluorocarbons (14% to 25%), methane (12% to 18%), nitrous oxides and other gases (13% to 19%). Some natural sources of air pollution are volcanoes, forest fires, “oceans, swamps, lakes, vegetative matter and insects†(Faiz, Sinha, Walsh and Varma, 1990, p. 3). Other sources which are caused by human activities are fuel like coal and wood burning and most importantly transport which is a major contributor towards air pollution. All the pollutants get dispersed in the air and pollution is measured by the mass of the pollutants per volume of air.