World Health Organization., & ProQuest (Firm). (2006). Air quality guidelines: Global update 2005 : particulate matter, ozone, nitrogen dioxide, and sulfur dioxide. Copenhagen, Denmark: World Health Organization.
Chicago Style CitationWorld Health Organization., and ProQuest (Firm). Air Quality Guidelines: Global Update 2005 : Particulate Matter, Ozone, Nitrogen Dioxide, and Sulfur Dioxide. Copenhagen, Denmark: World Health Organization, 2006.
MLA CitationWorld Health Organization., and ProQuest (Firm). Air Quality Guidelines: Global Update 2005 : Particulate Matter, Ozone, Nitrogen Dioxide, and Sulfur Dioxide. Copenhagen, Denmark: World Health Organization, 2006.
Warning: These citations may not always be 100% accurate.