Their decline is mostly due to falling fertility levels, although some have shown a dip in population due to natural calamities like New Orleans (due to hurricane Katrina ) and Sendai in Japan (tsunami). Most of these cities are located in Europe and some in Japan. It’s expected to grow to 28 million by 2041, according to the city. Out of the 1,063 cities with a population over 500,000, as many as 55 have shown a decline since 2000. With a population of 20 million, India’s capital Delhi is already one of the largest and most polluted cities in the world. Interestingly, not all cities are growing. The population density of India has inflated from 325 persons per square km in 2001 to 382 persons per square km in 2011, making Delhi, the capital city of India, the most densely populated Union. Of the 47 cities that grew by over 6% every year between 20, six were in Africa, 40 in Asia (including 20 in China) and just one in North America. By 2030, as many as 33 of the 41 mega cities will be from the third world. Indias census is conducted by about 330 000 government school teachers who first go door-to-door listing all houses across the country and then return to them with a second list of questions. Most of the urban growth is happening in developing countries in Asia and Africa. Currently, about 54% of the world's population is urban. By 2030, the world's population will decisively shift to urban living with 60% of the estimated population living in cities, big or small. Nearly 21% of the world's population stays in cities of population between 500,000 to 10 million, while an even bigger share of 26.8% resides in smaller cities and towns with a population of less than 500,000. The UN report shows that only a minority of urban dwellers actually live in mega cities. By 2030, Hyderabad and Ahmedabad will join them, as their respective populations would cross 10 million. Other Indian cities figuring in 2016's mega cities list are Mumbai, Kolkata, Bengaluru and Chennai. The report calculates that by 2030, the number of mega cities will increase to 41 and their population to about 730 million or 8.7% of the world's population.
That's about 6.8% of the world's population or 12% of the world's urban population. Around the world, about 500 million people live in 31 such mega cities. Such inclusion makes sense as people in these contiguous areas are economically and socially integrated with the main city. For example, in the case of Delhi urban agglomeration, the satellite cities of Ghaziabad, Noida, Faridabad and Gurgaon are included. In two months, India is projected to become the worlds most populous country with over 1.4 billion people. India’s second- and third-most populous states, Maharashtra (112 million) and Bihar (104 million), had roughly the same number of inhabitants as Mexico and the Philippines, the world’s 11th- and 12th-most populous countries in 2011. Although Indias the second most populated state, it also has the highest. The report has not relied on the administrative boundaries of cities but has, instead, preferred to use the concept of "urban agglomeration" which is the "the contiguous urban area, or built-up area". Kolkata is Indias 3rd most populous metropolitan area, the largest urban area includes the suburbs and has a population of more than 14.9 million. There are various largest Cities in Maharashtra, which are very popular in India. The facts have been revealed in the 2016 World Cities Report issued by the UN's department of economic and social affairs. There are currently 16 IITs spread across the major cities in India. Delhi will continue to be the second most populous city in the world till 2030, adding a staggering 9.6 million people to its population - the most in any mega city. India pollution data used for the rankings of India’s most polluted cities are openly available on openaq.NEW DELHI: At present, India is home to five mega cities, with over 10 million population, but by 2030 this number will go up to seven. The above rankings of the most polluted cities in India were ranked based on their 2022 average PM 2.5 pollution levels. These small pollutants are under 2.5 micrograms in width and are considered to be one of the more dangerous pollutants due to their ability to enter deep into the lungs and bloodstream. One of the most commonly tracked pollutants is very small, fine particles called PM 2.5. There are various pollutants (both particles and gases) that can be found in the air. How Air Pollution Was Measured to Find Most Polluted Cities in India Even the best city on the list (ranked 20th), Kaithal, averaged PM2.5 levels over 12-times the WHO recommended limit.
The worst city on the list, Hassan, averaged PM2.5 levels over 48-times higher than the WHO recommended limit. All of the ranked cities had average air quality many times above the WHO recommended healthy limit.
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