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!
三亚以其空气质量致胜，大连的城市安全与自然环境指数较高，而威海以其自然与文化环境跻身前五。
Sanya wins for its air quality and Dalian performs well in city safety and natural environment. Weihai, meanwhile, cracks the top five due to its natural and cultural environment.
城市空气质量水平是以空气质量指数(API)来表征的，API的时空变化可以反映城市空气质量的变化过程。
Urban air quality level is token by air quality index (API), whose spatiotemporal change can reflect the change of urban air quality.
收集了2006年《重点城市空气质量日报》中中国86个重点城市空气质量主要分析指标——空气污染指数（A PI）、首要污染物、空气质量级别，并对数据进行统计分析。
Analyze the main index, which include API, primary pollutant, air quality level, in 86 cities of china from Urban Ambient Air Quality Daily Report of 2006.
利用灰色统计模型分析了各城市空气质量等级，用上海大气质量指数法计算出污染负担率，然后根据污染负担率判断城市空气污染类型。
Air quality levels are analyzed in each city use of gray statistical strategy. The type of urban air pollution is judged by burden rate, which is calculated by the Shanghai air quality index.
利用灰色统计模型分析了各城市空气质量等级，用上海大气质量指数法计算出污染负担率，然后根据污染负担率判断城市空气污染类型。
Air quality levels are analyzed in each city use of gray statistical strategy. The type of urban air pollution is judged by burden rate, which is calculated by the Shanghai air quality index.
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