With the increasing trend of development and industrialization in Malaysia, air pollution has become an inevitable part of the process, resulting from increased vehicular activities and industrial processes. Toll operators are potentially exposed to high levels of air pollutants from working in proximity to traffic pollution sources, thereby increasing their risk of health defects associated with air pollution exposure. This study assessed the levels of Nitrogen dioxide (NO2) toll operators are exposed to, considering the influences traffic density and meteorological factors. This is intended to serve as an indicator of the cumulative pollution emanating from the combustion process of vehicles at toll plazas. Using Passive diffusion samplers saturated with Triethanolamine (TEA), the weekly indoor and outdoor NO2 concentrations at tollbooth were measured at Sungai Besi (SB), Kajang (KJ) and Putra-Makhota (PM) toll Plazas, to capture the varying traffic densities of 138,000, 65,000 and 24,100 vehicles/day respectively. The results showed that NO2 concentrations increase with traffic densities, and indoor NO2 concentrations correlated highly with outdoor NO2 concentrations (R2: SB = 0.767, KJ = 0.689 and PM = 0.877). The indoor/outdoor NO2 ratio varied from 0.7 to 1.2 for all toll booths, suggesting pollution control in-efficiency, caused by technical and behavioural factors. Also, meteorological factors had no significant effect on nitrogen dioxide concentrations, contrary to previous studies, which is likely due to the far distance between tool plazas and meteorological stations. Furthermore, the NO2 concentrations reported in this study were higher in comparison to weekly standards adopted in Germany (0.032 ppm) and previous literature. Therefore, toll operators are potentially exposed to high levels of pollution, and we advise that toll operators to wear pollution protection gears to reduce the risk of exposure, and the ventilation systems and mitigation measure (air curtain) reviewed to assess its efficiency.
References
[1]
Department of Environment (1996) Malaysia Environmental Quality Report. Department of Environment, Ministry of Science, Technology and Environment, Malaysia.
[2]
Beckerman, B., Jerrett, M., Brook, J.R., Verma, D.K., Arain, M.A. and Finkelstein, M.M. (2008) Correlation of Nitrogen Dioxide with Other Traffic Pollutants near a Major Expressway. Atmospheric Environment, 42, 275-290. https://doi.org/10.1016/j.atmosenv.2007.09.042
[3]
Gilbert, N.L., Goldberg, M.S., Brook, J.R. and Jerrett, M. (2007) The Influence of Highway Traffic on Ambient Nitrogen Dioxide Concentrations beyond the Immediate Vicinity of Highways. Atmospheric Environment, 41, 2670-2673. https://doi.org/10.1016/j.atmosenv.2006.12.007
[4]
Tsai, P.-J., Lee, C.-C., Chen, M.-R., Shih, T.-S., Lai, C.-H. and Liou, S.-H. (2002) Predicting the Contents of BTEX and MTBE for the Three Types of Tollbooth at a Highway Toll Station via the Direct and Indirect Approaches. Atmospheric Environment, 36, 5961-5969. https://doi.org/10.1016/S1352-2310(02)00768-9
[5]
Cheng, Y.-H., Huang, C.-H., Huang, H.-L. and Tsai, C.-J. (2010) Concentrations of Ultrafine Particles at a Highway Toll Collection Booth and Exposure Implications for Toll Collectors. Science of the Total Environment, 409, 364-369. https://doi.org/10.1016/j.scitotenv.2010.10.023
[6]
Shih, T.-S., et al. (2008) Elemental and Organic Carbon Exposure in Highway Tollbooths: A Study of Taiwanese Toll Station Workers. Science of the Total Environment, 402, 163-170. https://doi.org/10.1016/j.scitotenv.2008.04.051
[7]
Diab, R., Foster, S., Francois, K., Martincigh, B. and Salter, L. (2005) Carbon Monoxide Levels at a Toll Plaza near Durban, South Africa. Environmental Chemistry Letters, 3, 91-94. https://doi.org/10.1007/s10311-005-0111-1
[8]
Currie, J. and Walker, R. (2011) Traffic Congestion and Infant Health: Evidence from E-ZPass. American Economic Journal: Applied Economics, 3, 65-90. https://doi.org/10.1257/app.3.1.65
[9]
Bartin, B., Mudigonda, S. and Ozbay, K. (2008) Impact of Electronic Toll Collection on Air Pollution Levels: Estimation Using Microscopic Simulation Model of Large-Scale Transportation Network. Transportation Research Record: Journal of the Transportation Research Board, 2083, 105-113.
[10]
Raine, R.R., Stone, C.R. and Gould, J. (1995) Modeling of Nitric Oxide Formation in Spark Ignition Engines with a Multizone Burned Gas. Combustion and Flame, 102, 241-255. https://doi.org/10.1016/0010-2180(94)00268-W
[11]
Finlayson-Pitts, B.J. (2000) Chemistry of the Upper and Lower Atmosphere: Theory, Experiments, and Applications. Academic Press, San Diego, CA
[12]
World Health Organization (1997) Motor Vehicle Air Pollution Public Health Impact and Control Measures. WHO, Geneva.
[13]
Mücke, H. and Wagner, H. (1998) Anorganische Gase/Stickstoffdioxid. In: Wichmann, H.E., et al., Eds., Handbuch der Umweltmedizin: Toxikologie, Epidemiologie, Hygiene, Belastungen, Wirkungen, Diagnostik, Prophylaxe, Ecomed, Landsberg, Germany, 14.
[14]
Chitano, P., Hosselet, J.J., Mapp, C.E. and Fabbri, L.M. (1995) Effect of Oxidant Air Pollutants on the Respiratory System: Insights from Experimental Animal Research. European Respiratory Journal, 8, 1357-1371. https://doi.org/10.1183/09031936.95.08081357
[15]
Han, X. and Naeher, L.P. (2006) A Review of Traffic-Related Air Pollution Exposure Assessment Studies in the Developing World. Environment International, 32, 106-120. https://doi.org/10.1016/j.envint.2005.05.020
Azeez, K.H.A., Miura, M., Nishimura, Y. and Inokuma, S. (2005) Evaluating Transportation Impact on Environment in a Residential Area in Kuala Lumpur. Proceedings of the Eastern Asia Society for Transportation Studies, 5, 1815-1826.
[18]
Glasius, M., Carlsen, M.F., Hansen, T.S. and Lohse, C. (1999) Measurements of Nitrogen Dioxide on Funen Using Diffusion Tubes. Atmospheric Environment, 33, 1177-1185. https://doi.org/10.1016/S1352-2310(98)00285-4
[19]
McAdam, K., Steer, P. and Perrotta, K. (2011) Using Continuous Sampling to Examine the Distribution of Traffic Related Air Pollution in Proximity to a Major Road. Atmospheric Environment, 45, 2080-2086. https://doi.org/10.1016/j.atmosenv.2011.01.050
[20]
Singer, B.C., Hodgson, A.T., Hotchi, T. and Kim, J.J. (2004) Passive Measurement of Nitrogen Oxides to Assess Traffic-Related Pollutant Exposure for the East Bay Children’s Respiratory Health Study. Atmospheric Environment, 38, 393-403. https://doi.org/10.1016/j.atmosenv.2003.10.005
[21]
da Silva, A.S., Cardoso, M.R., Meliefste, K. and Brunekreef, B. (2006) Use of Passive Diffusion Sampling Method for Defining NO2 Concentrations Gradient in Sao Paulo, Brazil. Environmental Health, 5, 19. https://doi.org/10.1186/1476-069X-5-19
[22]
Elminir, H.K. (2005) Dependence of Urban Air Pollutants on Meteorology. Science of the Total Environment, 350, 225-237. https://doi.org/10.1016/j.scitotenv.2005.01.043
[23]
Moodley, K.G., Singh, S. and Govender, S. (2011) Passive Monitoring of Nitrogen Dioxide in Urban Air: A Case Study of Durban Metropolis, South Africa. Journal of Environmental Management, 92, 2145-2150. https://doi.org/10.1016/j.jenvman.2011.03.040
[24]
Mondal, R., Sen, G., Chatterjee, M., Sen, B. and Sen, S. (2000) Ground-Level Concentration of Nitrogen Oxides (NOx) at Some Traffic Intersection Points in Calcutta. Atmospheric Environment, 34, 629-633. https://doi.org/10.1016/S1352-2310(99)00216-2
[25]
Wondyfraw, M. (2014) Mechanisms and Effects of Acid Rain on Environment. Journal of Earth Science & Climatic Change, 5, 204.
[26]
Driscoll, J.A. (1997) Acid Rain Demonstration: The Formation of Nitrogen Oxides as a By-Product of High-Temperature Flames in Connection with Internal Combustion Engines. Journal of Chemical Education, 74, 1424. https://doi.org/10.1021/ed074p1424
[27]
Hardwick Jones, R., Westra, S. and Sharma, A. (2010) Observed Relationships between Extreme Sub-Daily Precipitation, Surface Temperature, and Relative Humidity. Geophysical Research Letters, 37, L22805.
[28]
Kojic, R. and Antic, M. (2016) The Influence of Meteorological Parameters and Traffic Flows on the Concentration of Ozone (O3) in Urban Areas in Brcko. JTTTP—Journal of Traffic and Transport Theory and Practice, 1, 12.
[29]
Ocak, S. and Turalioglu, F.S. (2008) Effect of Meteorology on the Atmospheric Concentrations of Traffic-Related Pollutants in Erzurum, Turkey. Journal of International Environmental Application & Science, 3, 325-335.
[30]
Vardoulakis, S., Solazzo, E. and Lumbreras, J. (2011) Intra-Urban and Street Scale Variability of BTEX, NO2 and O3 in Birmingham, UK: Implications for Exposure Assessment. Atmospheric Environment, 45, 5069-5078. https://doi.org/10.1016/j.atmosenv.2011.06.038
[31]
Kornartit, C., Sokhi, R.S., Burton, M.A. and Ravindra, K. (2010) Activity Pattern and Personal Exposure to Nitrogen Dioxide in Indoor and Outdoor Microenvironments. Environment International, 36, 36-45. https://doi.org/10.1016/j.envint.2009.09.004
[32]
Stevenson, K., Bush, T. and Mooney, D. (2001) Five Years of Nitrogen Dioxide Measurement with Diffusion Tube Samplers at over 1000 Sites in the UK. Atmospheric Environment, 35, 281-287. https://doi.org/10.1016/S1352-2310(00)00171-0
[33]
Campbell, G.W., Stedman, J.R. and Stevenson, K. (1994) A Survey of Nitrogen Dioxide Concentrations in the United Kingdom Using Diffusion Tubes, July-December 1991. Atmospheric Environment, 28, 477-486. https://doi.org/10.1016/1352-2310(94)90125-2
[34]
Atkins, D.H.F. and Lee, D.S. (1995) Spatial and Temporal Variation of Rural Nitrogen Dioxide Concentrations across the United Kingdom. Atmospheric Environment, 29, 223-239. https://doi.org/10.1016/1352-2310(94)00229-E
[35]
Varshney, C.K. and Singh, A. (2003) Passive Samplers for NOx Monitoring: A Critical Review. The Environmentalist, 23, 127-136. https://doi.org/10.1023/A:1024883620408
[36]
Chang Ho, Y., Maria, T.M. and Clifford, P.W. (2008) Passive Dosimeters for Nitrogen Dioxide in Personal/Indoor Air Sampling: A Review. Journal of Exposure Science and Environmental Epidemiology, 18, 441. https://doi.org/10.1038/jes.2008.22
[37]
University of Nottingham Malaysia Campus (2011) F84M02 Techniques in Environmental Monitoring and Management, Passive Monitoring of Nitrogen Dioxide Concentration.
[38]
Monn, C., Brandli, O., Schindler, C., Ackermann-Liebrich, U. and Leuenberger, P. (1998) Personal Exposure to Nitrogen Dioxide in Switzerland. Science of the Total Environment, 215, 243-251. https://doi.org/10.1016/S0048-9697(98)00124-7
[39]
Heal, M.R., O’donoghue, M.A. and Cape, J.N. (1999) Overestimation of Urban Nitrogen Dioxide by Passive Diffusion Tubes: A Comparative Exposure and Model Study. Atmospheric Environment, 33, 513-524.
[40]
Heal, M.R. and Cape, J.N. (1997) A Numerical Evaluation of Chemical Interferences in the Measurement of Ambient Nitrogen Dioxide by Passive Diffusion Samplers. Atmospheric Environment, 31, 1911-1923. https://doi.org/10.1016/S1352-2310(97)00025-3
[41]
Bush, T., Smith, S., Stevenson, K. and Moorcroft, S. (2001) Validation of Nitrogen Dioxide Diffusion Tube Methodology in the UK. Atmospheric Environment, 35, 289-296. https://doi.org/10.1016/S1352-2310(00)00172-2
[42]
Department of Environment (2009) Malaysia Environmental Quality Report. Department of Environment, Ministry of Science, Technology and Environment, Malaysia.
[43]
Keuken, M., Roemer, M. and van Den Elshout, S. (2009) Trend Analysis of Urban NO2 Concentrations and the Importance of Direct NO2 Emissions versus Ozone/NOx Equilibrium. Atmospheric Environment, 43, 4780-4783. https://doi.org/10.1016/j.atmosenv.2008.07.043
[44]
Chen, C. and Zhao, B. (2011) Review of Relationship between Indoor and Outdoor Particles: I/O Ratio, Infiltration Factor and Penetration Factor. Atmospheric Environment, 45, 275-288. https://doi.org/10.1016/j.atmosenv.2010.09.048
[45]
Yassen, M.E., Jahi, J.M. and Ahmad, S. (2005) Evaluation of Long Term Trends in Oxide of Nitrogen Concentrations in the Klang Valley Region, Malaysia. Malaysian Journal of Environmental Management, 6, 59-72.
[46]
Breysse, P.N., et al. (2005) Indoor Exposures to Air Pollutants and Allergens in the Homes of Asthmatic Children in Inner-City Baltimore. Environmental Research, 98, 167-176. https://doi.org/10.1016/j.envres.2004.07.018
[47]
Health Canada (1989) Exposure Guidelines for Residential Indoor Air Quality: A Report of the Federal-Provincial Committee on Environmental and Occupational Health. Health Canada, Ottawa.
[48]
Gallelli, G., Orlando, P., Perdelli, F. and Panatto, D. (2002) Factors Affecting Individual Exposure to NO2 in Genoa (Northern Italy). Science of the Total Environment, 287, 31-36. https://doi.org/10.1016/S0048-9697(01)00990-1
[49]
Gilbert, N.L., Woodhouse, S., Stieb, D.M. and Brook, J.R. (2003) Ambient Nitrogen Dioxide and Distance from a Major Highway. Science of the Total Environment, 312, 43-46. https://doi.org/10.1016/S0048-9697(03)00228-6
[50]
Oke, T.R. (2007) Siting and Exposure of Meteorological Instruments at Urban Sites. In: Borrego, C. and Norman, A.-L., Eds., Air Pollution Modeling and Its Application XVII, Springer, New York, 615-631.
[51]
Jamaludin, N., Mohammed, N.I., Khamidi, M.F. and Wahab, S.N.A. (2015) Thermal Comfort of Residential Building in Malaysia at Different Micro-climates. Procedia—Social and Behavioral Sciences, 170, 613-623. https://doi.org/10.1016/j.sbspro.2015.01.063
[52]
Rajagopalan, P., Chuan, L.K. and Jamei, E. (2014) Urban Heat Island and Wind Flow Characteristics of a Tropical City. Solar Energy, 107, 159-170. https://doi.org/10.1016/j.solener.2014.05.042
[53]
Salem, A., Soliman, A. and El-Haty, I. (2009) Determination of Nitrogen Dioxide, Sulfur Dioxide, Ozone, and Ammonia in Ambient Air Using the Passive Sampling Method Associated with Ion Chromatographic and Potentiometric Analyses. Air Quality, Atmosphere & Health, 2, 133-145. https://doi.org/10.1007/s11869-009-0040-4
[54]
Mukerjee, S., et al. (2004) Field Method Comparison between Passive Air Samplers and Continuous Monitors for VOCs and NO2 in El Paso, Texas. Journal of the Air & Waste Management Association, 54, 307-319. https://doi.org/10.1080/10473289.2004.10470903
[55]
Chao, C.Y.H. and Law, A. (2000) A Study of Personal Exposure to Nitrogen Dioxide Using Passive Samplers. Building and Environment, 35, 545-553. https://doi.org/10.1016/S0360-1323(99)00040-2
[56]
Danish, S. and Madany, I.M. (1992) Concentrations of Nitrogen Dioxide throughout the State of Bahrain. Environmental Pollution, 77, 71-78. https://doi.org/10.1016/0269-7491(92)90160-C
[57]
Cho, H.S. and Choi, M.J. (2014) Effects of Compact Urban Development on Air Pollution: Empirical Evidence from Korea. Sustainability (Switzerland), 6, 5968-5982. https://doi.org/10.3390/su6095968
[58]
Fang, C., Liu, H., Li, G., Sun, D. and Miao, Z. (2015) Estimating the Impact of Urbanization on Air Quality in China Using Spatial Regression Models. Sustainability (Switzerland), 7, 15570-15592. https://doi.org/10.3390/su71115570
[59]
Bose, R.K. (1998) Automobiles and Environmental Sustainability: Issues and Options for Developing Countries. Asian Transport Journal, 13, 1-16.
[60]
Mehmood, T., Ali, Z., Noor, N., Sidra, S., Nasir, Z. and Colbeck, I. (2015) Measurement of NO2 Indoor and Outdoor Concentrations in Selected Public Schools of Lahore Using Passive Sampler. Journal of Animal and Plant Sciences, 25, 681-686.
[61]
Schwela, D. (2006) Urban Air Pollution in Asian Cities: Status, Challenges and Management. Routledge, London.
[62]
Valero, N., et al. (2009) Concentrations and Determinants of Outdoor, Indoor and Personal Nitrogen Dioxide in Pregnant Women from Two Spanish Birth Cohorts. Environment International, 35, 1196-1201. https://doi.org/10.1016/j.envint.2009.08.002
