雾霾haze;
　　烟雾smog;
　　空气污染指数air pollution index;
　　橙色预警orange alert;
　　悬浮颗粒物airborne particulate matter;
　　可吸入颗粒物inhalable particle;
　　有毒物质toxic substance;
　　空气质量检测air quality monitoring;
　　实时发布PM2.5数据release real-time PM2.5 data