1. Vapi - India
Vapi is a city and municipality in the Valsad district of Gujarat, India. According to the 2001 Indian census, Vapi has a population of 71,395 people, with 58% male and 42% female. The literacy rate in Vapi is 73%, higher than the national average of 59.5%, with 79% for males and 64% for females. In Vapi, 14% of the population is under 6 years old.
Vapi is a rapidly developing industrial center in India, primarily focused on the chemical industry. Consequently, everything from water, land to the air in this area is heavily polluted, making it challenging to breathe, eat, or drink anything.
Despite its dense population, Vapi is fortunate not to face the water drainage issues that Mumbai does. At least, that's the hope. Vapi is a city and municipality in the Valsad district of Gujarat, India, with a population of over 71 thousand.
Currently, Vapi is a rapidly developing industrial center in India. However, the predominant industry in this area is the chemical industry, leading to severe pollution of the land, water, and air. People here face challenges in breathing and consuming anything. Fortunately, the city's drainage system is still functioning well, without any hindrance.

2. La Oroya - Peru
Peru, situated in Southwestern South America, shares borders with Ecuador and Colombia to the north, Brazil to the east, Bolivia to the southeast, Chile to the south, and the Pacific Ocean to the west.
Peru's territory is the cradle of many ancient cultures, ranging from the Norte Chico civilization—one of the world's oldest ancient civilizations, to the Inca Empire—the largest empire in pre-Columbian America. The Spanish Empire conquered the region in the 16th century, establishing a Viceroyalty with the capital in Lima. After gaining independence in 1821, Peru experienced periods of political instability, economic crises, as well as stable and progressive economic periods.
Peru is a democratic republic divided into 25 regions. Its geography varies from arid coastal plains along the Pacific to the peaks of the Andes and tropical rainforests in the Amazon basin. Peru is a developing country with a high Human Development Index and a poverty rate of around 25.8%. Key economic activities include mining, manufacturing, agriculture, and fishing.
Peru is a multicultural nation with an estimated population of 30.4 million, comprising indigenous peoples, European descendants, Afro-Peruvians, and Asians. While Spanish is the official language, a significant number of Peruvians speak Quechua or other indigenous languages. The blending of cultural traditions contributes to Peru's diversity in areas such as art, cuisine, literature, and music.
La Oroya is a city of around 33,000 people on the Mantaro River in central Peru. It is located in the Andes, 176 km east-northeast of the capital Lima and serves as the capital of Yauli Province. The city is notorious for being one of the 'world's worst pollution places.'
The primary industry here is lead mining and refining. Since 1992, this industry has flourished, causing severe lead pollution in the air, soil, and water. Children in this city are subjected to three lead level tests, and 99% of them have elevated lead levels in their bodies.

3. Pernik - Bulgaria
Pernik is a city located in western Bulgaria, approximately 30 km southwest of Sofia. The city has a population of 83,869 people (as of March 2007) and 81,052 people in 2011. It is the main city in the Pernik Province and lies on both sides of the Struma River in the Pernik Valley between the Viskyar, Vitosha, and Golo Bardo mountains.
The area covers km2. It is the 11th largest city in Bulgaria. Initially, the site was a Thracian fortress established in the 4th century BCE, and later a Roman settlement. Pernik became part of the Bulgarian Empire in the early 9th century as an important fortress.
The name Pernik is believed to derive from the Slavic god Perun, with the Slavic suffix -nik added, first mentioned in the 9th century. The medieval town served as a crucial Bulgarian stronghold during the Bulgarian wars against the Byzantine Empire in the 11th century, enduring several Byzantine sieges.
From 1396 to 1878, the city was under Ottoman rule. In the 20th century, the city rapidly developed as a center for coal mining and heavy industry. During Bulgaria's communist period, the city was called Dimitrovo from 1949 to 1962, named after the Bulgarian Communist leader Georgi Dimitrov.
Pernik is a city located in western Bulgaria, about 30 km west of Sofia, with a population of approximately 83,869 people. It must be noted that Bulgaria as a whole is facing a severe air pollution crisis.
In this city, coal is burned for heating during the winter, and most cars are old models produced by the former Soviet Union. Therefore, this place is hard to avoid the title of the world's most polluted. Especially in the current air, it is predominantly emissions from the metallurgical industry. In such a suffocating environment, it's challenging for the people here to live comfortably.

4. Lâm Phần - China
Lâm Phần is situated in the southwestern part of Son Tay province, in the lower reaches of the Phan River, bordering Truong Tri and Tan Thanh to the east, the Yellow River to the west (also the border with Thiem Tay province), Tan Trung and Lu Luong to the north, and Van Thanh to the south. This municipal area extends from latitude 35° 23′ N to 36° 37′ N, with a width of 170 kilometers (110 miles), and from longitude 110° 22′ E to 112° 34′ E, with a length of 200 km (120 miles). The municipal area covers 20,275 square kilometers (7,828 square miles), accounting for 13% of the province's total area.
Lâm Phần has a semi-arid continental climate, influenced by monsoons (Köppen BSk), with somewhat cold and dry winters and hot, somewhat humid summers. The average temperature 24 hours per month ranges from −2.7 °C (27.1 °F) in January to 26.1 °C (79.0 °F) in July, with an annual average of 12.6 °C (54.7 °F). The annual precipitation is around 470 millimeters (18.5 in), with about 70% falling from June to September. The non-freezing period averages 190 days per year. Extreme temperatures range from −22.5 °C (−8.5 °F) to 40.5 °C (104.9 °F).
Lâm Phần is a municipal area in Son Tay province, China, with a population of 4.3 million people. The primary industries in Lâm Phần are coal mining and food processing. The government of the country has asserted that Lâm Phần has become a landfill, and the pollution level here is extremely severe.
Most Chinese people use coal as their main fuel, and the majority of the coal comes from Lâm Thần. The continuous mining and burning of coal by the people of Lâm Thần have caused severe air pollution in this city, as it is constantly shrouded in industrial smog. Here, scientists estimate that breathing the smog here for one day is as harmful as smoking three packs of cigarettes.

5. Los Angeles - USA
Los Angeles is the largest city in the state of California and the second-largest in the United States, located in Los Angeles County. The city is also commonly referred to as Los (Lốt) by the Vietnamese community in the surrounding areas. According to the 2000 census, the city has a population of 3,694,820. The surrounding areas of this city, also known as Southern California, including Los Angeles County, San Bernardino County, Orange County, Riverside County, and Ventura County, are among the most populous regions in the United States, with 16 million people.
The city was founded in 1781 by the Spanish in Mexico with the name El Pueblo de Nuestra Señora Reina de los Ángeles de la Porciúncula ('The Town of Our Lady the Queen of Angels of the Porciúncula' in Spanish, porciúncula meaning 'small portion' and los Ángeles meaning 'the angels'). In 1821, when Mexico gained independence from Spain, the city became part of Mexico. After the U.S.-Mexican War, Los Angeles came under U.S. control.
This city is renowned as a center of the film industry. Many celebrities live in the nearby city of Beverly Hills, and numerous movies and TV shows are filmed in Hollywood, a part of this city. According to the 2000 U.S. Census, the number of Vietnamese Americans in Los Angeles is 19,747, making up 0.5% of the city's total population.
Los Angeles is the largest city in California and the second-largest in the United States, located in Los Angeles County. This city is the second in the country to be on this list. While the air in Pittsburgh is heavily polluted due to the excess dust in the air, in Los Angeles, the foul smell of waste is extremely severe.
If this foul smell goes straight to the ozone layer, the residents here may have been spared. However, these foul odors linger around the city, causing serious damage to the lungs of the people living here.

6. Ciudad Juarez - Mexico
Ciudad Juárez (officially known today as Heroica Ciudad Juárez, but abbreviated as Juárez and formerly known as El Paso del Norte) is a city and the capital of the state of Chihuahua, Mexico. The city covers a total area of 188 km², with an elevation of 1137 meters above sea level. According to the 2010 census by the National Institute of Statistics and Geography (Instituto Nacional de Estadística y Geografía), the population is 1,321,004 with a population density of 374 people/km², and the metropolitan population is 1,457,955. This makes it the 7th most populous city in Mexico. The city is located along the Rio Grande (Río Bravo del Norte), south of El Paso, Texas. Together, El Paso and Ciudad Juárez form one of the largest binational metropolitan areas in the world, with a total population of 2.4 million people.
Ciudad Juarez is one of the fastest-growing cities in the world, despite being called the 'most violent area in the world outside a declared war zone.' In 2001, the Federal Reserve Bank of Dallas released a report stating that in Ciudad Juárez, 'the average annual growth rate in the 10-year period from 1990-2000 is 5.3%. Juárez's population growth is much higher than the Chihuahua state and even Mexico'.
There are four international ports of entry connecting Ciudad Juárez and El Paso, Texas, including the Bridge of the Americas, the Ysleta International Bridge, the Paso del Norte Bridge, and the Stanton Street Bridge. These border-crossing locations allowed 22,958,472 people to pass through in 2008, making Ciudad Juárez a major hub for immigration and transportation for all the northern Mexican centers. The city has a developing industrial center with over 300 maquiladoras (assembly plants) located in and around the city. According to The New York Times in 2007, Ciudad Juárez is 'now taking up new industrial real estate at a faster pace than any other city in North America'. In 2008, FDI Magazine voted Ciudad Juárez as the 'City of the Future'. In 2011, the state of Chihuahua changed the name to Heroica Ciudad Juárez for promotional purposes. That year, the maquiladoras created 10,000 new jobs, with a total of 19 factories located in Ciudad Juárez.
Ciudad Juarez is a city in Mexico with a total area of 188 km². The elevation of this area is 1137 m above sea level. Despite being the 3rd world country, the living environment in Mexico is not too bad. Although the people of Mexico are very clean, they face many problems with drug crime, making some cities very noticeable. Because of this reason, Ciudad Juarez is one of the most notable cities. In addition, the current situation of public waste or industrial waste disposal areas has made the environment here not as good as before.

7. Norilsk - Russia
Norilsk is an industrial city located in the Krasnoyarsk Krai, Russia. The city is situated above the Arctic Circle, east of the Yenisei River, and south of the Taymyr Peninsula to the west. It has a permanent population of 175,000, with a total population of 220,000 if including temporary residents.
It is the northernmost city in the world with over 100,000 inhabitants and the second-largest city (after Murmansk) inside the Arctic Circle. Norilsk and Yakutsk are the only major cities located within the continuously frozen Arctic region.
Norilsk was largely built by the forced labor of the Gulag labor camp system during the Soviet era. The Norilsk-Talnakh nickel mine is the largest known nickel-copper-palladium deposit in the world. The smelting of nickel ore is directly responsible for severe pollution, often appearing as acid rain and smog. According to some estimates, one percent of the global sulfur dioxide emissions come from the nickel mines in Norilsk.
Norilsk is a city in Russia with a population of 134,882 people. It is considered the 122nd largest city in Russia. When the primary industry is metal mining, pollution in this area is unavoidable. However, the air pollution levels in Norilsk are becoming increasingly dire.
It is estimated that every year, the mining plants in this area discharge about 4 million tons of metal dust into the air, including cadmium and lead. The air pollution here is so severe that even plant life struggles to survive.


