We have been trying all measures to reduce pollution in the past few years. Now people can enjoy a fresh environment everywhere. The following two graphs are adopted from the column of “City Information” on the webpage of Beijing Review.
Graph 1: Olympic Cities Air Quality Report
City |
Date |
API |
Major Pollutant |
Air Quality Degree |
Quality Condition |
Beijing |
Sep. 8 |
37 |
N/A |
Ⅰ |
Very good |
Qinhuangdao |
Sep. 8 |
52 |
PM10 |
Ⅱ |
Good |
Qingdao |
Sep. 8 |
68 |
PM10 |
Ⅱ |
Good |
Shanghai |
Sep. 8 |
67 |
PM10 |
Ⅱ |
Good |
Shenyang |
Sep. 8 |
88 |
PM10 |
Ⅱ |
Good |
Tianjin |
Sep. 8 |
54 |
PM10 |
Ⅱ |
Good |
Graph 2: Chinese National Standard
API Values |
Levels of health concern |
Colors |
When the API is in this range: |
...air quality conditions are: |
...as symbolized by this color: |
0 to 50 |
Very good |
Blue |
51 to 100 |
Good |
Green |
101 to 150 |
Slight pollution |
Yellow |
151 to 200 |
Moderate pollution |
Orange |
201 to 250 |
Medium pollution |
Red |
251 to 300 |
High pollution |
Purple |
301 to 500 |
Hazardous |
Brown |
Notes:
**API stands for Air Pollution Index(指数).
**Particulate matter (PM10) is a major component of air pollution that threatens both our health and our environment. It consists of very small liquid and solid particles floating in the air.
**Sulfur dioxide(SO2) acts as an acid.Inhalation(吸入) results in labored breathing, coughing, or a sore throat and may cause permanent lung damage.
According to Graph 1, which of the following cities has the worst air pollution?
A.Qinhuangdao. | B.Tianjin. | C.Qingdao | D.Shenyang. |
If your city is symbolized by either red or purple, the pollution in your city is .
A.Moderate or high. | B.Moderate or slight. |
C.Medium or high. | D.Medium or slight. |
Which of the following statements is TURE?
A.With API value below 150 the air is free from being polluted. |
B.The colors from purple to Yellow indicate the air quality is becoming much worse. |
C.When there are floating solid particles and dust in the air, it is dangerous pollution. |
D.On September 8th the color-symbol of Beijing City’s air quality is ‘Blue’. |
When more citizens are beginning to have labored breathing soon after they are in the open air, it suggests that .
A.there is a large amount of sulfur dioxide in the air |
B.it is so cold that they may have caught a cold |
C.they are starting to cough or have a fever |
D.they must be infected with permanent lung disease |