“What Is PM2.5?” 4 July 2008. http://www.epa.gov/region4/sesd/pm25/p2.htm#5

has been cited by the following article:

• TITLE: Air Quality Status of Respirable Particulate Levels at Selected Traffic Junctions along the Section of Lateral Highway in Hyderabad

  AUTHORS: Manda Karunakar Reddy, Mareddy Sumathi

  KEYWORDS: PM2.5, Air Borne Particle, Traffic, Respirable Dust, Particle Size

  JOURNAL NAME: Journal of Environmental Protection, Vol.2 No.5, July 20, 2011

  ABSTRACT: The aerodynamic diameter of an air borne particle is the key property in determining its respiratory deposition. The study aim to assess PM2.5 level and its size distribution at 5 traffic junctions located along the lateral highway connected to NH-202. A cascade impactor has been used to measure the size function range of PM2.5 apart from PM10 of atmospheric dust particles in air being PM2.5 is concern with respect to effect on human health and is able to tend deeply into the respiratory tract reaching the lungs. It is observed that weight % of PM2.5 values are in the range of 40% - 60% of PM10 and few values of PM2.5 are exceeding the standards prescribed by CPCB. It is concluded that free flow of traffic is main concern and maintenance of road should be carried out during low traffic hours.