Air Quality at Night Markets in Taiwan (original) (raw)
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Science of The Total Environment, 2004
To characterize indoor air quality at the markets in Hong Kong, three non-air-conditioned and two air-conditioned markets were selected for this study. The indoor air pollutants measured included PM (particulate matters with 10 aerodynamic diameter less than 10 mm), total bacteria count (TBC), carbon monoxide (CO), nitric oxide (NO), nitrogen dioxide (NO) and sulfur dioxide (SO). The indoor and outdoor concentrations of these target air pollutants 2 2 at these markets were measured and compared. The effects of air conditioning, temperatureyrelative humidity variation and different stalls on the indoor air quality were also investigated. The results indicated that all of the average indoor concentrations of PM , TBC, CO and NO at the markets were below the Hong Kong Indoor Air Quality 10 2 Objectives (HKIAQO) standards with a few exceptions for PM and TBC. The elevated PM concentrations at 10 10 3 10 that measured at vegetable, fish and meat stalls. Furthermore, the concentration of airborne bacteria at the poultry stalls was as high as 1031 CFUym , which was above the HKIAQO standard of 1000 CFUym. The bacteria levels 3 3 at other three stalls were all below the HKIAQO standard. Statistical analysis indicated that there were no significant differences among the four stalls for CO, NO and SO. x 2