警察局已经安装了一套全面的摄像系统，车牌阅读器和空气监测器。
The police department has installed an extensive camera system, licence-plate readers and air monitors.
北京的官方空气监测器只是监测相对较大的颗粒物，而美国的系统监测器是针对更小、更有害的微粒。
Beijing's official air monitors only measure relatively coarse particulate matter, whereas the U. s. system monitors smaller, deadlier dust particles.
在鸽子背上安设空气监测器不仅会使人们更加关注这个问题，也能让伦敦市民用可行的方式更真切、更直观地意识到污染的影响。
Putting air sensors on the back of pigeons goes beyond raising awareness of this problem and helps Londoners understand the impact of pollution in an accessible, tangible and immediate way.
在鸽子背上安设空气监测器不仅会使人们更加关注这个问题，也能让伦敦市民用可行的方式更真切、更直观地意识到污染的影响。
Putting air sensors on the back of pigeons goes beyond raising awareness of this problem and helps Londoners understand the impact of pollution in an accessible, tangible and immediate way.
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