美国有线新闻 CNN 通过查看空气质量指数保护健康

 

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?

SUBTITLE¹: 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 pollutants² that are regulated by the Clean Air Act. Ground level ozone³ 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 asthma⁴ 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 hazardous⁵ 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.

1 subtitle   

n.副题（书本中的），说明对白的字幕

参考例句：

• His new book has a subtitle.他的新书有一个副标题。
• Ah!I don't know why they don't subtitle these movies.唉！我不知道这些电影为什么不打字幕。

2 pollutants   

污染物质（尤指工业废物）( pollutant的名词复数 )

参考例句：

• Pollutants are constantly being released into the atmosphere. 污染物质正在不断地被排放到大气中去。
• The 1987 Amendments limit 301(g) discharges to a few well-studied nonconventional pollutants. 1987年的修正案把第301条（g）的普通排放限制施加在一些认真研究过的几种非常规污染物上。 来自英汉非文学 - 环境法 - 环境法

3 ozone   

n.臭氧，新鲜空气

参考例句：

• The ozone layer is a protective layer around the planet Earth.臭氧层是地球的保护层。
• The capacity of ozone can adjust according of requirement.臭氧的产量可根据需要或调节。

4 asthma   

n.气喘病，哮喘病

参考例句：

• I think he's having an asthma attack.我想他现在是哮喘病发作了。
• Its presence in allergic asthma is well known.它在过敏性气喘中的存在是大家很熟悉的。

5 hazardous   

adj.(有)危险的，冒险的；碰运气的

参考例句：

• These conditions are very hazardous for shipping.这些情况对航海非常不利。
• Everybody said that it was a hazardous investment.大家都说那是一次危险的投资。