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Exposure levels of particulate matter in long‐distance buses in Taiwan
Author(s) -
Huang H.L.,
Hsu D.J.
Publication year - 2009
Publication title -
indoor air
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.387
H-Index - 99
eISSN - 1600-0668
pISSN - 0905-6947
DOI - 10.1111/j.1600-0668.2009.00587.x
Subject(s) - particulates , environmental science , automotive engineering , environmental engineering , meteorology , engineering , geography , chemistry , organic chemistry
This study investigated the passenger exposure to particulate matter (PM) in long-distance buses in Taiwan. PM and CO(2) were measured in thirty buses traveling between Taipei and Tainan. The results indicated that average in-cabin PM levels were below the guidelines or standards suggested by Taiwan and other countries. Cigarette smoking revealed no effect on in-cabin PM2.5 level. However, since only one cigarette was lit per journey, the effect might be different if more cigarettes were lit in bus cabins. Opening windows was found to affect in-cabin PM2.5 and PM2.5/PM10 ratios may be elevated. Moreover, the PM10 level from air monitoring stations did not reflect the true passenger exposure to PM10. This study concludes that PM levels in long-distance buses is lower than those in other studies of urban buses, as a result of faster driving speed, non-stop driving pattern, and highway surroundings. Keeping windows closed on long-distance buses can minimize passenger exposure to PM2.5. Conversely, high in-cabin CO(2) levels may occur if opening window is minimized when air change rate is low. This study suggests that long-distance buses should increase their air exchange rates to reduce CO(2) levels and install particle filters with high removal efficiency to lower in-cabin PM levels.