@book{8113,
	author = {WHO Expert Committee on Air Quality Criteria and Guides for Urban Air Pollutants (1972 : Geneva). and World Health Organization.},
	title = {Air quality criteria and guides for urban air pollutants : report of a WHO Expert committee [meeting held in Geneva from 5 to 11 April 1972].},
	publisher = {World Health Organization,},
	year = {1972.},
	series = {(WHO technical report series ; 506)},
	address = {Geneva : }
}