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  • In 2016, the World Health Organization released a study, suggesting that 80 percent of people

  • living in cities are breathing unhealthy air.

  • Some cities, especially those in developing nations have it particularly bad, with city

  • officials going to extreme measures to protect residents from respiratory diseases.

  • So what are the world’s most polluted cities?

  • Well, ranking cities by their level of pollution is difficult because scientists study air

  • quality in different ways.

  • Some score air quality based on the number of particles that are less than or equal to

  • 2 and a half micrometers in diameter, which are produced from all types of combustion

  • and are small enough to get into your lungs or blood tissue.

  • Others place more emphasis on particles as large as 10 micrometers in diameter, like

  • dust and mold.

  • When ranked according to these larger particles, the most polluted city is Onitsha, Nigeria.

  • Experts say Onitsha’s pollution is a product of its rapid growth and industrialization.

  • The city’s population has doubled to more than one million people in the last few years,

  • leaving its existing infrastructure inadequate and outdated.

  • As a result, Onitsha has some of the worst traffic in Nigeria, lacks any proper waste

  • incineration plants and has little to no regulations on its factories, hospitals, metal industries

  • and other carbon emitters.

  • When it comes to those smaller particles, the most polluted air is actually in the eastern

  • Iranian city of Zabol.

  • Zabol’s pollution problem is somewhat unique, as the city is not a population or industrial

  • hub.

  • Instead, its excess air particles are actually a product of continuous dust storms.

  • Every summer, temperatures in Zabol exceed 104 degrees, and the city is struck with what

  • locals call, ‘120 days of wind’.

  • In the early 2000s, the region’s primary wetland dried up, creating another major source

  • of dust.

  • Hundreds of residents have since evacuated because of the resulting pollution, and many

  • who have stayed have been diagnosed with pollution related diseases, like tuberculosis.

  • In 2015, the air became so dirty that city officials were forced to distribute free face

  • masks.

  • But one city that consistently tops the charts is Delhi, India.

  • According to the World Health Organization, Delhi has the worst air quality of any other

  • major city in the world, with particle levels twice as high as China’s infamously polluted

  • Beijing.

  • Most of Delhi’s air pollution is a product of vehicle emissions, as the city’s enormous

  • population of nearly 25 million people contributes to heavy traffic.

  • The effects of Delhi’s pollution are devastating and extremely widespread.

  • Adults are known to suffer from headaches, sore throats and reduced lung capacity, and

  • studies suggest that nearly half of all Delhi's children have irreversible lung damage.

  • Delhi’s air quality becomes measurably worse in the winter, as wind carries in dust from

  • neighboring regions.

  • This, combined with other factors, brought the city’s smog levels to new highs in November

  • of 2016, forcing its people into a full-blown state of emergency.

  • Schools were closed down, sports games were canceled and residents were encouraged to

  • stay indoors.

  • Delhi’s chief minister has taken steps to address the problem, but nothing has been

  • successful yet in curbing pollution.

  • To be certain, air pollution is not limited to industrial cities in developing nations.

  • It’s a global problem, with most of the world’s urban populations already breathing

  • in hazardous airborne particles on a daily basis.

  • What’s more, many cities don’t even measure their air quality.

  • This is only the tip of the iceberg; the real statistics likely paint a much bleaker picture.

  • There are activists around the world fighting to protect the environment and wildlife.

  • Seeker Stories filmed with a group of women in South Africa that are fighting off poachers

  • more effectively than drones or thermal imagingand they don’t use any weapons.

  • Black Mamba anti-poaching unit was first founded in 2013, snaring dropped 97 percent in the

  • first year in this region.

  • The first 13 months of operation we didn't lose a single rhino throughout the reserve.

  • Thanks for watching Seeker Daily; don't forget to like and subscribe so you get new videos

  • from us every day.

In 2016, the World Health Organization released a study, suggesting that 80 percent of people

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世界上汙染最嚴重的城市有哪些? (What Are The World’s Most Polluted Cities?)

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    BH 發佈於 2021 年 01 月 14 日
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