In Beijing, the average air-quality index (AQI) over the past month was 195 micrograms per cubic meter, peaking at 470.

在北京，过去一个月的平均空气质量指数(AQI)为每立方米195微克，最高达到470微克。

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Local media reported that the air in Beijing on Friday pushed past 300 AQI on the air Quality Index, a level deemed 'hazardous'.

当地媒体报道说，北京星期五的空气质量指数超过了300 AQI，达到了“危险”的级别。

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There's something called the Air Quality Index, or the AQI, and it keeps track of how clean or populated the air is on a day to day basis.

空气质量指数，简称AQI，是对每天空气清洁或污染的情况进行追踪记录。

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The U.S. Environmental Protection Agency (EPA) has developed a formula to convert PM 2.5 readings into an AQI value that can help guide health-related decisions.

FORBES: Air Quality In China

For example, an AQI value of 50 represents good air quality with little potential to affect public health, while an AQI value over 300 represents hazardous air quality.

FORBES: Air Quality In China

The U.S. Embassy in Beijing publishes AQI values for Beijing and other cities in China, and the Chinese Ministry of Environmental Protection provides its own air quality data for cities throughout the country.

FORBES: Air Quality In China