...同季节、不同气象条件下低空大气污染物稀释扩散和清除能力的综合指标，建立对我省省辖市、省直管县（市）城市空气质量指数（AQI）指导产品统计方法，完善空气质量预报模型，开展我省城市环境空气质量预测预警工作。
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目前，污染物测量是在一个城市的多个不同地点进行测量的，然后数据会合计成一个数字(空气质量指数)最后在网站上每天发布一次。
Currently, pollutants are measured at different stations in a city and that data is aggregated to a single number (the air quality index) and published once a day on a website.
因此，北就的空气质量指数与世界各大城市相比，有些部份表现最差，也就不足为奇了
So it is no surprise that Beijing has some of the worst air pollution of any big city on earth.
这个城市的空气质量实在是太差了！污染指数那么高，以至于我们都已不再希望于外出时戴防毒面具保护自己了。
The air quality in this city is horrendous. The pollution levels are so high that we are not supposed to go outside with a face mask again!
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