墨西哥城的空气污染警报系统对北京市建立空气污染警报管理系统有很大的借鉴作用。
The air pollution alarm system of Mexico City provides Beijing much experience on establishing an air pollution alarm management system.
上周日国家天文台公布了新的空气污染橙色警报，这意味着包括北京在内的一些北方地区不得不在阴霾下度过元旦。
Some areas in northern China including Beijing will pass New Year's Day under a cloud as the national observatory renewed an orange alert for air pollution on Sunday.
尽管面临着非常严重的空气污染，但北京相关部门因很少发出污染警告，一直以来被谴责。而当前的警报系统在两年前就开始工作了。
The authorities had been criticised in the past for rarely issuing pollution warnings, despite facing several bouts of serious pollution. The current alert system started two years ago.
这就是为什么许多城市建立了空气污染监测，因为公共卫生当局想确定是否需要发布环境污染警报。
This is why many air pollution monitors have been set up, because public health authorities want to know if there is a need to issue an alert for bad pollution.
这就是为什么许多城市建立了空气污染监测，因为公共卫生当局想确定是否需要发布环境污染警报。
This is why many air pollution monitors have been set up, because public health authorities want to know if there is a need to issue an alert for bad pollution.
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