A new study has found that people living in South and Central Asia experience some of the highest levels of air pollution in the world .
一項新研究發現，生活在南亞和中亞的人們承受著世界上最嚴重的空氣污染之一。
The air in these areas has the highest amounts of the most kind of air pollution .
這些地區的空氣中，危害最大的那類空氣污染物含量最高。
A micron is one millionth of a meter .
一微米是一公尺的百萬分之一。
PM2.5 is so small that it can enter human lungs and the blood .
PM2.5非常小，可以進入人的肺部和血液。
The Switzerland-based company IQAir released its latest study on Tuesday .
總部位於瑞士的IQAir公司週二發布了最新研究報告。
The company operates an air quality information system .
該公司營運著一個空氣品質資訊系統。
The yearly IQAir reports began in 2017 .
IQAir的年度報告始於2017年。
Glory Dolphin Hammes is chief of IQAir North America .
葛洛莉·多爾芬·哈米斯是IQAir北美公司的負責人。
She told VOA : "PM2.5 actually kills more people than any other air quality pollutant .”
她對美國之音說：「實際上，PM2.5導致的死亡人數比其他任何空氣污染物都多。」
Based on data from IQAir's worldwide network , Bangladesh is the country with the highest levels of PM2.5 air pollution .
根據IQAir全球網絡的數據，孟加拉是PM2.5空氣污染水準最高的國家。
Chad , Pakistan , Tajikistan and India are also among the five nations with the lowest air quality .
查德、巴基斯坦、塔吉克和印度也名列空氣品質最差的五個國家之中。
IQAir found that New Delhi , India , is the capital city with the most PM2.5 pollution .
IQAir發現，印度新德里是PM2.5污染最嚴重的首都。
Dhaka , Bangladesh ; N'Djamena , Chad ; Dushanbe , Tajikistan ; and Muscat , Oman , are the other capital cities rated as having extremely polluted air .
孟加拉達卡、查德恩加美納、塔吉克杜尚別和阿曼馬斯喀特是其他被評為空氣極度污染的首都。
People seeking the world's cleanest air will find it in the French overseas territory of New Caledonia .
想尋找世界上最潔淨空氣的人，可以在法國海外領地新喀里多尼亞找到。
The territory's main city , Noumea , is at the top of IQAir's clean air ranking .
該領地的主要城市努美阿位居IQAir潔淨空氣排名榜首。
Other places where the air is very clean include the U.S . Virgin Islands and Puerto Rico in the Caribbean .
空氣非常潔淨的其他地方包括加勒比海的美屬維京群島和波多黎各。
Cape Verde , in the Atlantic Ocean off the coast of Africa , also has very little air pollution .
位於非洲海岸外大西洋上的維德角，空氣污染也非常少。
Some parts of the developing world lack enough monitoring , Dolphin Hammes said .
多爾芬·哈米斯說，發展中國家的一些地區缺乏足夠的監測。
Those areas include parts of Africa , the Middle East and South America .
這些地區包括非洲、中東和南美洲的部分地區。
Developed countries usually have a greater number of air quality monitors than developing countries and areas .
已開發國家的空氣品質監測器通常比發展中國家和地區多。
Monitoring is at a higher level than in past years in some countries , she said .
她說，一些國家的監測水準比往年更高。
In 2021 , air pollution levels increased from those of a year earlier : the first year of the COVID-19 pandemic .
2021年的空氣污染水準比前一年（即新冠疫情的第一年）有所上升。
In 2020 , the world saw a decrease in air pollution because of less ground and air transportation .
2020年，由於地面和空中交通減少，全球空氣污染有所下降。
Another reason for the rise in air pollution last year was an increase in wildfires , Dolphin Hammes said .
多爾芬·哈米斯說，去年空氣污染加劇的另一個原因是野火增多。
The WHO said the reduction would prevent millions of deaths worldwide .
世衛組織表示，這一降低將在全球避免數百萬人死亡。
Scientists supported the new recommendations .
科學家們支持這些新建議。
But they worry that some countries would have trouble reaching them .
但他們擔心一些國家難以達到這些標準。
Much of the world was already failing to meet the 10-microgram limit , Reuters news agency reported .
據路透社報導，世界上許多地方本來就達不到10微克的上限。
IQAir's yearly reports are based on PM2.5 measurements from what is now a total of 6,475 cities in 117 countries , regions and territories .
IQAir的年度報告基於目前117個國家、地區和領地共6475個城市的PM2.5測量數據。
The worldwide information comes from "tens of thousands of regulatory and low-cost air quality monitoring stations ,” the company said .
該公司表示，這些全球資訊來自「數以萬計的官方及低成本空氣品質監測站」。
The stations are operated by governments , nonprofit organizations , research centers and citizen scientists .
這些監測站由政府、非營利組織、研究中心和公民科學家營運。