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Atmosphere 2012, 3(2), 266-287; doi:10.3390/atmos3020266
Article

An Examination of the Sensitivity of Sulfur Dioxide, Nitric Oxide, and Nitrogen Dioxide Concentrations to the Important Factors Affecting Air Quality Inside a Public Transportation Bus

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Received: 16 April 2012; in revised form: 30 May 2012 / Accepted: 7 June 2012 / Published: 15 June 2012
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Abstract: The present study examined the sensitivity of sulfur dioxide (SO2), nitric oxide (NO), and nitrogen dioxide (NO2) concentrations to the important factors affecting air quality inside a public transportation bus. Additionally, this study quantified the in-bus contaminant concentrations in relation to the ranked statistically significant variables. The independent variables to which the monitored contaminant concentrations are the most sensitive to were determined using regression trees and the analysis of variance. A comprehensive one-year database, of the monitored contaminant concentrations and the independent factors that affect an indoor microenvironment (meteorology, monitoring periods, outdoor sources, and ventilation settings) was developed to study the sensitivity of monitored in-bus contaminants. SO2 concentrations were extremely sensitive to the month, weather conditions, and heavy vehicles. NO concentrations were sensitive to the month/season, ventilation, and ambient temperature; while NO2 concentrations were additionally sensitive to the monitoring period and the ambient mixing ratio. Quantified in-bus relationships revealed NO and NO2 concentrations to be less than 0.6 ppm and 0.1 ppm, respectively. SO2 concentrations of 0.4 ppm were observed in the fall-winter months, when the lead heavy vehicles were at a minimum density of 56 per hour; < 0.4 ppm SO2 concentrations remained for the rest of the year.
Keywords: indoor air quality; regression trees; analysis of variance; sulfur dioxide; nitric oxide; nitrogen dioxide; sensitivity analysis indoor air quality; regression trees; analysis of variance; sulfur dioxide; nitric oxide; nitrogen dioxide; sensitivity analysis
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Kadiyala, A.; Kumar, A. An Examination of the Sensitivity of Sulfur Dioxide, Nitric Oxide, and Nitrogen Dioxide Concentrations to the Important Factors Affecting Air Quality Inside a Public Transportation Bus. Atmosphere 2012, 3, 266-287.

AMA Style

Kadiyala A, Kumar A. An Examination of the Sensitivity of Sulfur Dioxide, Nitric Oxide, and Nitrogen Dioxide Concentrations to the Important Factors Affecting Air Quality Inside a Public Transportation Bus. Atmosphere. 2012; 3(2):266-287.

Chicago/Turabian Style

Kadiyala, Akhil; Kumar, Ashok. 2012. "An Examination of the Sensitivity of Sulfur Dioxide, Nitric Oxide, and Nitrogen Dioxide Concentrations to the Important Factors Affecting Air Quality Inside a Public Transportation Bus." Atmosphere 3, no. 2: 266-287.


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