Many people spend large part of time indoors—as much as 80-90% of their lives. We work, study, eat, drink and sleep in enclosed (封闭的) environment where there isn’t much fresh air. For these reasons, some experts feel that more people suffer from the effects of indoor air pollution than outdoor pollution.
There are many reasons to cause serious indoor air pollution, such as smoking, cooking and heating appliances (仪器). Also we can smell vapors (蒸汽) from building materials, paints, furniture, which can cause pollution inside buildings. Some kind of natural dangerous gas from the earth can be found concentrated (集中的) in basements (地下室) in some parts of the United States.
Pollution at home and work is often greater than outdoors. It is estimated (估计) that indoor air pollution levels are 25-62% greater than outside levels and can cause serious health problems.
Both indoor and outdoor pollution need to be controlled and prevented.
【小题1】What is the passage about?【小题2】Why do some experts say we suffer more inside?
【小题3】Nature doesn’t produce dangerous gas, does it?
【小题4】How many kinds of indoor pollution are mentioned in houses in this passage?
【小题5】Which is more dangerous, indoor pollution or outdoor pollution?
Can you believe Chengdu is short of water? In March 2022, the government said the city will face serious water shortage in 2030. Some other cities in southern China, like Shenzhen and Guangzhou, are also becoming “thirsty”. Compared with northern areas, southern areas have more rain and are close to more rivers and lakes. So why are they still short on water?
As we know, populations are growing fast in these cities. So people and factories need more and more water. Each person in Chengdu has less than 600 m3 of water each year. It’s 1/4 of the country’s average (平均). The situation in Shenzhen is worse. It’s 1/12 of the country’s average. According to the UN, it is a “real water shortage” when it’s below 500 cubic meters.
Climate (气候) change is making the water problem worse. For example, most cities in Chengdu depend on Minjiang River as its main source(来源) of water. Recent years, there isn’t enough water running into the river. The change also causes less snow in the mountains. They might provide less water in the future.
What’s more, water pollution makes it harder to get clean drinking water. Factories and farms don’t use water properly.
March 22 is World Water Day. This year, the key point is “groundwater”. We can’t see groundwater. It’s under our feet. But it plays an important role in our lives. About 98 percent of Earth’s fresh water is groundwater. But in many places, people pollute groundwater.
The fact: Southern areas are still short on water. Chengdu will face serious water shortage in |
The results | |
Larger populations in the big cities than before. | Need more water. The average water of each person in Shenzhen is |
Climate change increases(增加) the | Less water in the future. |
Factories and farms don’t use water properly. | Water pollution. |
People |
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