根据天气预报的风、涡度及天气状况、大气稳定度、混合层高度等气象因子，用数值预报模式，对污染源强度进行未来24小时预报的扩散计算，从而做出空气污染预报。如果污染源强度很强，超过了当地污染警戒线，则发布空气污染警报，呼吁社会合作，政府重视，民众采取自我保护措施。
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.
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