Stay-at-home Order Does Not Bring Down Mexico City’s Pollution

Government orders for people to stay home to halt the spread of the coronavirus have resulted in a sharp decrease of vehicle traffic around the world.

Cities such as Delhi, India, Los Angeles in the United States and Seoul in South Korea all have reported better air quality. But that is not the case with Mexico's capital, although its traffic has decreased by 60 percent.

The official website of Mexico City says that air quality there is "poor." It warns that exercising at certain times of the day presents a "high" to "very high" health risk. Photographs taken by Reuters last week show a thick haze¹ over the city.

Mexico City is about 2240 meters above sea level and is surrounded by mountains. The city and the area around it is home to more than 20 million people.

Most are staying inside their homes, but they have increased the use of gas and other fuels possibly for cooking. Methane² gas is released from open-air waste holding areas. In addition, a lot of industrial activity continues. All these things have cancelled the reduction in pollution that was expected from putting the economy on hold.

Sergio Hernandez oversees³ air quality in the city. He told Reuters news agency, "We're seeing that it's come down form the peaks, but it's not enough to bring the air quality below the norm."

Carlos Alvarez is head of Mexico Communication and Environment, an environmental group. He said that there are 400 open-air waste holding areas, or dumps. They release methane gas.

There also are 50,000 industrial generators⁴ in the city. The generators provide electricity to hotels, offices and businesses. Most are still operating. The generators use gasoline or diesel⁵ fuel, as do the 350,000 trucks and buses that operate in the area.

Environmental experts say diesel is a leading cause of harmful pollution. Other causes include the state oil company Pemex's oil processing center in the north, forest fires and ash from the volcano Popocatepetl to the southeast.

The air quality in Mexico City is better than it was when the World Health Organization said it was the world's most polluted city in 1992. But, it is still poor. Bad air quality is linked to high rates of diseases that affect the lungs. Experts warn that COVID-19, the disease caused by the novel coronavirus, could be more dangerous in Mexico City than in other places.

Roxana Trejo takes care of patients infected with the coronavirus at the ABC medical center in Mexico City. "(Pollution) can be a serious issue once you get the disease," she said.

I'm Mario Ritter, Jr.

Words in This Story

haze –n. dust, smoke or mist that fills the air

norm –n. the usual way that something is, what is expected

issue –n. a problem that has to be dealt with

1 haze   

n.霾，烟雾；懵懂，迷糊；vi.(over)变模糊

参考例句：

• I couldn't see her through the haze of smoke.在烟雾弥漫中，我看不见她。
• He often lives in a haze of whisky.他常常是在威士忌的懵懂醉意中度过的。

2 methane   

n.甲烷，沼气

参考例句：

• The blast was caused by pockets of methane gas that ignited.爆炸是由数袋甲烷气体着火引起的。
• Methane may have extraterrestrial significance.甲烷具有星际意义。

3 oversees   

v.监督，监视( oversee的第三人称单数 )

参考例句：

• She oversees both the research and the manufacturing departments. 她既监督研究部门又监督生产部门。 来自《简明英汉词典》
• The Department of Education oversees the federal programs dealing with education. 教育部监管处理教育的联邦程序。 来自互联网

4 generators   

n.发电机，发生器( generator的名词复数 )；电力公司

参考例句：

• The factory's emergency generators were used during the power cut. 工厂应急发电机在停电期间用上了。
• Power can be fed from wind generators into the electricity grid system. 电力可以从风力发电机流入输电网。 来自《简明英汉词典》

5 diesel   

n.柴油发动机，内燃机

参考例句：

• We experimented with diesel engines to drive the pumps.我们试着用柴油机来带动水泵。
• My tractor operates on diesel oil.我的那台拖拉机用柴油开动。