If the AQI is above 201. Anyone caught violating the regulation will face a fine of up to 500 yuan.

如果空气质量指数大于201时，任何被发现违反规定者将面临高达500元以下的罚款。

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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