Pencemaran udara adalah masuknya atau dimasukkannya zat, energi dan/atau komponen lain ke dalam udara ambien oleh kegitan manusia, sehingga mutu udara ambien turun sampai ke tingkat tertentu yang menyebabkan udara am bien tidak dapat memenuhi fungsinya.Peraturan Pemerintah No. 41 Tahun 1999 Tentang : Pengendalian Pencemaran Udara

Pencemaran udara adalah masuknya atau dimasukkannya zat, energi, dan atau komponen lain ke dalam udara oleh kegiatan manusia, sehingga mutu udara turun sampai ke tingkat tertentu yang menyebabkan atau mempengaruhi kesehatan manusia.Keputusan Menteri Kesehatan Republik Indonesia nomor 1407/MENKES/SK/XI/2002

Pencemaran udara diartikan adanya bahan-bahan atau zat asing di dalam udara yang menyebabkan terjadinya perubahan komposisi udara dari susunan atau keadaan normalnya.Wardhana, Wisnu Arya. 2004. Dampak Pencemaran Lingkungan (Edisi Revisi). Yogyakarta: Penerbit Andi

Pencemaran udara adalah masuk atau dimasukkannya makhluk hidup, zat, energi dan atau komponen lain ke udara dan atau berubahnya tatanan udara oleh kegiatan manusia atau oleh proses alam, sehingga kualitas udara turun sampai ke tingkat tertentu yang menyebabkan udara menjadi kurang atau tidak dapat berfungsi lagi sesuai dengan peruntukannya.Keputusan Menteri Negara Kependudukan dan Lingkungan Hidup nomor: KEP-02/MENKLH/I/1988 tentang Pedoman Penetapan Baku Mutu Lingkungan

Pencemaran udara diartikan sebagai adanya bahan-bahan atau zat-zat asing didalam udara yang menyebabkan perubahan susunan (komposisi) udara dari keadaan normalnya.http://library.usu.ac.id/download/ft/kimia-nurhasmawaty2.pdf

Pencemaran udara adalah dimasukkannya komponen lain ke dalam udara, baik oleh kegiatan manusia secara langung atau tidak langsung maupun akibat proses alam sehingga kualitas udara turun sampai ke tingkatan tertentu yang menyebabkan lingkungan menjadi kurang atau tidak dapat berfungsi lagi sesuai peruntukannya.Chandra, Budiman.2005. Pengantar Kesehatan Lingkungan. Jakarta : Buku Kedokteran EGC

Air pollutant is any substance emitted into the air from an anthropogenic, biogenic, or geogenic source, that is either not part of the natural atmosphere or is present in higher concentrations than the natural atmosphere, and may cause a short-term or long-term adverse effect.Daly, A. and P. Zannetti. 2007. Ambient Air Pollution. http://www.envirocomp.org/j/books/chapters/1aap.pdf

Air pollution is the presence of substances in air in sufficient concentration and for sufficient time, so as to be, or threaten to be injurious to human, plant or animal life, or to property, or which reasonably interferes with the comfortable enjoyment of life and property.http://www.rrcap.ait.asia/male/manual/national/02chapter2.pdf

Air pollution may be defined as any atmospheric condition in which certain substances are present in such concentrations that they can produce undesirable effects on man and his environment.http://www.cartercenter.org/resources/pdfs/health/ephti/library/lecture_notes/env_health_science_students/AirPollution.pdf

Air pollution may be defined as any atmospheric condition in which substances are present at concentrations high enough above their normal ambient levels to produce a measurable effect on man, animals, vegetation, or materials.http://www.edb.utexas.edu/petrosino/Legacy_Cycle/mf_jm/Challenge%201/air%20pollution.pdfAir pollution occurs when the air contains gases, dust, fumes or odour in harmful amounts. That is, amounts which could be harmful to the health or comfort of humans and animals or which could cause damage to plants and materials.EPA Victoria. http://www.epa.vic.gov.au/air/aq4kids/pollution.asp

Air pollution may be defined as the presence of any solid, liquid or gaseous substance including noise and radioactive radiation in the atmosphere in such concentration that may be directly and indirectly injurious to humans or other living organisms, plants, property or interferes with the normal environmental processes.http://download.nos.org/333courseE/10.pdf

Air pollution means the presence in the atmosphere of one or more air contaminants in such quantities and of such duration as is or tends to be injurious to human health or welfare, animal or plant life, or property, or would unreasonably interfere with the enjoyment of life or property.http://docs.legis.wisconsin.gov/code/admin_code/nr/400/400.pdf

Air pollution is the presence in ambient atmosphere of substances, generally resulting from the activity of man, in sufficient concentration, present for a sufficient time and under circumstances which interfere significantly with the comfort health or welfare of person or with the full use or enjoyment property.Indian Standards Institution IS-4167 (1966)

Air pollution is the excessive concentration of foreign matter in the air which adversely affects the well being of the individual or causes damage to property.American Medical Association

Air pollution is defined as the discharge into the atmosphere of foreign gases, vapours, droplets, and particulates, or of excessive amounts of normal constituents either from natural sources such as volcanoes , or from mans activities.WHO, 1972