To test the idea that concentration of air pollutants such as NO
x, CO and SPM is significantly increased in enclosed spaces frequented by automobiles, an investigation of air pollution at a 52-space underground parking lot was carried out. Average concentrations of NO
2, NO, CO, SPM and HCHO were 103ppb, 221ppb, 8.7ppm, 20.7μg/m
3 and 18.0ppb respectively. Concentrations of NO
x and CO were significantly higher than outdoors. Correlation between NO
x and CO concentrations and the number of parking cars was not high, because the automobile sources of the pollutants were immediately present.
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