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Evaluating near highway air pollutant levels and estimating emission factors: Case study of Tehran, Iran
Nayeb Yazdi, M ; Sharif University of Technology | 2015
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- Type of Document: Article
- DOI: 10.1016/j.scitotenv.2015.07.141
- Publisher: Elsevier , 2015
- Abstract:
- A field sampling campaign was implemented to evaluate the variation in air pollutants levels near a highway in Tehran, Iran (Hemmat highway). The field measurements were used to estimate road link-based emission factors for average vehicle fleet. These factors were compared with results of an in tunnel measurement campaign (in Resalat tunnel). Roadside and in-tunnel measurements of carbon monoxide (CO) and size-fractionated particulate matter (PM) were conducted during the field campaign. The concentration gradient diagrams showed exponential decay, which represented a substantial decay, more than 50-80%, in air pollutants level in a distance between 100 and 150meters (m) of the highway. The changes in particle size distribution by distancing from highway were also captured and evaluated. The results showed particle size distribution shifted to larger size particles by distancing from highway. The empirical emission factors were obtained by using the roadside and in tunnel measurements with a hypothetical box model, floating machine model, CALINE4, CT-EMFAC or COPERT. Average CO emission factors were estimated to be in a range of 4 to 12g/km, and those of PM
10 were 0.1 to 0.2g/km, depending on traffic conditions. Variations of these emission factors under real working condition with speeds were determined - Keywords:
- Air pollution ; CO ; PM10 ; Roadside ; Amphibious vehicles ; Carbon ; Cobalt ; Fleet operations ; Light transmission ; Particle size analysis ; Pollution ; Size distribution ; Transportation ; Tunnels ; Concentration gradients ; Emission factors ; Exponential decays ; Tehran ; Traffic conditions ; Tunnel measurements ; Carbon monoxide ; Atmospheric pollution ; Motorway ; Roadside environment ; Traffic emission ; Tunnel ; Case study ; Concentration (parameters) ; Environmental temperature ; Exhaust gas ; Highway ; Iran ; Particle size ; Particulate matter ; Priority journal ; Traffic ; Resalat Tunnel ; Tehran [Iran] ; Tehran [Tehran (PRV)]
- Source: Science of the Total Environment ; Volume 538 , December , 2015 , Pages 375-384 ; 00489697 (ISSN)
- URL: http://www.sciencedirect.com/science/article/pii/S0048969715304836