The government said that only 8 of the 74 cities monitored managed to meet national standards in the same year, measuring particles found in the air, carbon monoxide and ozone. Until recently the governmental air quality index did not include ozone and PM2.
WHO says that in the last two years, as more and more cities have begun measuring smog levels, the agency has doubled its outdoor air pollution databasewhich now covers 3, cities in countries.
In high-income nations, 56 percent of cities with more thanresidents fail to meet WHO air quality limits. In lower-income countries, that figure jumps to 98 percent, according to the recent findings.
Ambient air pollution kills 3 million people globally each year and is considered by WHO as the " greatest environmental risk to health. Poor air quality, the agency warns, can lead to an increased risk of stroke, heart disease, lung cancer and chronic and acute respiratory diseases, including asthma.
Today, no country is at greater risk than India. In fact, the heavily populated South Asian country is home to 22 of the 50 most polluted cities in the world, according to the data. Coming in at 1, on the list was Visalia, California, the most polluted city in the United States.
One success story is the Indian capital of New Delhi, which dropped to No. WHO ranks cities on their average daily concentration of PM 2. Below, a look at the 10 cities with the most polluted air, along with their yearly average PM 2.Dec 19, · Watch video · While Beijing smothered under a cloud of smog and a reputation for horrible air, other cities in the world quietly vie for the tarnished crown of world's most polluted city.
And 's winner is. Beijing is not among the 10 Chinese cities with the worst air quality nor among the 10 Chinese cities with the best air quality. China names 10 most polluted cities. And while the air pollution in China is still something of concern, there are many other countries with heavy pollution.
Case in point: India is home to nine of the top ten most polluted cities in. 15 of 20 most polluted cities in world are in India, China, says Jim Webb. By Louis Jacobson on Thursday, October 15th, at p.m. May 08, · Air quality in most cities that monitor their pollution levels exceed what the World Health Organization deems as safe.
No Chinese cities ranked in the top 20 most polluted cities, despite. Watch video · What's the most polluted city in the world?
First, not all cities collect good enough data to be measured (a problem in itself). Bottled Canadian air has become popular in smog-heavy China.