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Recently, some new buses made in China have been purchased to give the transportation services in Bangkok due to their lower price. Unfortunately, volatile air pollutants emitted from material in new motor vehicles was little concern. The objective of this study was to conduct a preliminary survey of total volatile organic chemicals (TVOCs) in the cabins of some new buses used in public transportation in Bangkok. TVOCs was monitored in the air-condition buses running within Bangkok area under actual driving condition. Three buses were randomly sampled from three routes, i.e. the route number 8, 539 and 542. All of sampling buses were manufactured in year 2007 using EURO II diesel engine criteria. In addition, a used bus made in Japan (from route number 515) was randomly selected for a background comparison. The results of the monitoring showed that all four buses contained TVOCs concentrations ranging from 1.40-3.74 mg m-3, which exceeded the US EPA maximum allowable indoor air concentration standard of 0.20 mg m-3. TVOCs found in the new buses were higher than the used one because newer material of in-vehicle ornament would possibly release much more TVOCs. There may be the relationship between the mileage (or driving duration) and TVOCs level, however, too few samples were taken might not be enough to prove any relationship. Besides, emission for other sources such as fuel leakage and infiltration of contaminated from ambient air was uncontrolled. In conclusion, the result provided important information on TVOCs concentration in the passenger cabins of public bus.
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