Vehicle-related ammonia emissions in Hong Kong |
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Authors: | Peter A Tanner |
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Institution: | (1) Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, China |
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Abstract: | Weekly passive sampling of ambient ammonia has been performed at ground or rooftop levels at 12 locations in Hong Kong representing
different land use categories. The highest weekly average roadside level of ammonia in Hong Kong was 7.1 μg m−3 at a street canyon site. Ambient ammonia concentrations for a rooftop urban-residential site with nearby light traffic were
<1 μg m−3, being less than at an adjacent road and indoor car-park. Rooftop levels of ammonia showed a significant correlation with
nitrogen monoxide concentrations. Honeycomb denuder samplings were also carried out at the rooftop site and the results were
consistent with passive sampling. It is concluded that the 0.54 M vehicles in Hong Kong make a considerable contribution to
ambient ammonia concentrations, which are otherwise low. |
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