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88 ± 0.91 μg m-3 of HULIS on regional days, which was about 5 times higher than its contribution (0.39 ± 0.34 μg m-3) on local days. Of the three identified primary sources, biomass burning had the largest contribution on both regional (34.9%) and local days (24.6%). Marine vessels were also a significant contributor, especially on local days (20.3%). Vehicle exhaust, on the other hand, showed a negligible contribution to HULIS (2.1%) in Hong Kong in this study.The number and production capacities of greenhouse farms have been increased acr
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