Characterization of black carbon at roadside sites and along vehicle roadways in the Bangkok Metropolitan Region

Title
Characterization of black carbon at roadside sites and along vehicle roadways in the Bangkok Metropolitan Region
Authors
Nguyen Tri Quang Hung이승복Nguyen Thanh HangJira KongpranNguyen Thi Kim Oanh심상규배귀남
Keywords
Bangkok; Black carbon; Rain; Season; Traffic; Vehicle exhaust
Issue Date
2014-08
Publisher
Atmospheric environment
Citation
VOL 92, 231-239
Abstract
To understand the seasonality of concentrations of traffic-related black carbon (BC) in a megacity, BC concentrations in fine particles were monitored at the roadside and on roads during both the wet and dry seasons of 2010 in the city center of Bangkok, Thailand. The BC concentration measured every 2 min by an aethalometer at the Dingdaeng roadside in the dry season was 17.9 ± 6.6 μg m−3, which was 1.6-fold higher than the value (11.5 ± 2.7 μg m−3) during the wet season. This seasonal difference could not be explained by washout by rain but was instead due to more frequent upwind conditions caused by a prevailing wind direction from the monitoring site toward the road in the wet season. When the prevailing wind direction was from the road, the average BC concentration at the roadside increased up to 30 μg m−3 during both seasons. In contrast, when the wind direction was from the site to the road, the BC concentration was reduced to the level of urban background concentrations measured inside Lumphini Park and the Dusit Zoo of Bangkok. Roadside BC concentrations were strongly correlated with NOx concentrations and elemental carbon (EC) concentrations measured in 24-h PM2.5 filter samples. Both relationships exhibited linear determination coefficients of more than 0.80, implying that NOx can be used as an indicator and an alternative for traffic-related BC at this roadside site when real-time BC monitors are not available.
URI
http://pubs.kist.re.kr/handle/201004/48116
ISSN
13522310
Appears in Collections:
KIST Publication > Article
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