School of Energy and Environment, City University of Hong Kong, Kowloon Tong, Hong Kong.
Guy Carpenter Climate Change Centre, City University of Hong Kong, Kowloon Tong, Hong Kong.
Environ Monit Assess. 2020 Apr 19;192(5):295. doi: 10.1007/s10661-020-8243-0.
June 2019 saw large-scale street protests in Hong Kong that impeded traffic flow along streets in areas around to the Legislative Council building. These had the potential to reduce overall air pollutant emissions from traffic and lower their concentrations. Two roadside monitoring stations relatively close to the Legislative Council reveal that measured concentrations of nitrogen dioxide declined during the protests compared with measurements from other sites by at least 50% on many occasions. There were only subtle changes in particulate loads and no evidence of any reduction in carbon monoxide concentrations. Pedestrianisation and bus route rationalisation are often seen as methods to reduce exposure in congested areas, but the observations here suggest that the substantial improvements in the nitrogen dioxide levels might not be matched by improvements in other pollutants. Plans for changes to street layouts to improve air quality need careful investigation before they are implemented.
2019 年 6 月，香港发生了大规模的街头抗议活动，这些活动阻碍了立法会大楼周边地区街道的交通流量。这些抗议活动有可能减少交通产生的整体空气污染物排放量，并降低其浓度。两个离立法会比较近的路边监测站显示，与其他站点的测量值相比，在许多情况下，氮氧化物的测量浓度在抗议期间下降了至少 50%。颗粒物负荷只有细微变化，没有证据表明一氧化碳浓度有任何降低。行人化和公交线路合理化通常被视为减少拥挤地区暴露的方法，但这里的观察结果表明，二氧化氮水平的大幅改善可能不会带来其他污染物的改善。在实施之前，需要对改善空气质量的街道布局改变计划进行仔细调查。
