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21英语教师网 > 备课资源 > 拓展阅读 > 正文
Rating our air quality
作者:21ST    来源:21英语网    日期: 2012-03-19

人教版高一年级:Healthy eating

关键词:Problems with diet; Balanced diet and nutrition

话题归类:健康Health

 

 

空气质量的高低直接影响我们的生活



词数 351 建议阅读时间 6分钟

IS the air in your area clean or not? How do people rate (划分等级) the air quality?

An index (指数) with numbers can quickly tell you how good or bad something is. The Air Quality Index (AQI) or the Air Pollution Index (API) uses a scale from 0 to 500. On days measuring less than 100, the air is clean. The dirtier the air gets, the higher are the numbers. On days measuring more than 100, the air can be bad for you to breathe.

The AQI or the API also uses colors going from Green to Yellow to Orange to Red to Purple to Maroon (栗色). Each color tells you the air is less clean than the color before. Green tells you the air quality is at its best.

The index is to help you understand what local air quality means to your health. To make it easier to understand, the AQI is divided into six categories:

Each category means a different level of health concern. The six levels of health concern and what they mean are as follows:

Good: The AQI value for your community is between 0 and 50. Air quality is considered satisfactory.

Moderate (中等): The AQI for your community is between 51 and 100. Air quality is acceptable. However, there may be a moderate health concern for a very small number of people. For example, people who are very sensitive to air pollution may experience respiratory symptoms (呼吸道疾病征兆).

Unhealthy for Sensitive Groups: When AQI values are between 101 and 150, members of sensitive groups may experience health effects. This means they are likely to be affected at lower levels than the general public. The general public is not likely to be affected when the AQI is in this range.

Unhealthy: Most may begin to experience health effects when the AQI values are between 151 and 200. Members of sensitive groups may experience more serious health effects.

Very Unhealthy: AQI values between 201 and 300 mean everyone may experience more serious health effects.

Hazardous (危险的): AQI values over 300 give health warnings of emergency conditions. The entire population is likely to be affected.




关键词:关键词: 人教版 高一 Healthy eating 健康Health







 

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