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CNN英语新闻:通过查看空气质量指数保护健康

比目鱼 于2017-01-12发布 l 已有人浏览
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佐治亚州亚特兰大市距离火灾发生地只有数英里远,该市周三的空气质量指数为不良。田纳西州查塔努加市的空气质量指数是151。
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Wednesday's air quality index in Atlanta, Georgia, miles away from any of the fires, was unhealthy. In Chattanooga, Tennessee, it was 151. What exactly does that mean?

SUBTITLE: What is the AQI?

JENNIFER GRAY, CNN METEOROLOGIST: The one thing you need to know is that if you were like many who suffer when the air quality is poor, relief could be just a click away.

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. The Environmental Protection Agency calculates the AQI on five major pollutants that are regulated by the Clean Air Act. Ground level ozone and particle pollution are the greatest threat to human health.

The Air Quality Index runs from zero to 500, with 500 being the most unhealthy.

Anything over 100 could be considered unhealthy for sensitive groups. We're talking about people with asthma as well as heart conditions.

Everyone will start feeling the effects of poor air quality when the number reaches 150 or above. Anything over 300 is considered hazardous air quality.

It's encouraged on these high level days to limit your outdoor activities and stay indoors. Exercising outdoors during one of these high level days could result in serious health consequences.

So, before you go outside, check the AQI to protect yourself and to have better health.

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