According to conservationists from Greenpeace, inthere are exactly 30 cities in the world that are practically full of garbage. We have all heard about the bad environmental situation in India, so it is not surprising that 22 of the dirtiest cities are located in this country. In 2019, it became known that the level of air pollution in the Indian city of Delhi had reached its limit and was officially recognized as hazardous to health. Then the city was covered with a suffocating shroud of exhaust gases, which is why schools were closed and construction work stopped. The sudden pollution was caused by the burning of agricultural fields to prepare the land for the next planting. Several months have passed since then, and researchers have announced that the air in the city has become much cleaner. Can you already guess why?
Clean air in cities
You probably already know the answer to this question, butnevertheless - before announcing the solution, let's consider how much the air has freshened in India. Recently, researchers from the University of Surrey (England) decided to estimate the amount of harmful substances in the air of five Indian cities: Delhi, Chennai, Hyderabad, Calcutta and Mumbai. In particular, they were interested in concentration fine particles PM2.5 - these 10nm elements are piecessoot, asphalt, heavy metals and other harmful substances. It is believed that they have a detrimental effect on the respiratory system, cardiovascular system and the entire human body as a whole.
Fine particles Are particles of a substance with a diameterfrom 10 micrometer. For comparison, a human hair is 100 micrometers thick. This means that about 40 fine particles can be placed on the cross section of one hair.
A group of scientists studied the composition of the air in Indiancities and found that over the past few months it has become much cleaner. So, in the city of Mumbai, 10% less substances harmful to the human body were found. But most of all, the researchers were surprised by the state of the air in Delhi - it became cleaner by as much as 54%! It is far from the clean air of remote places from cities, but this is an excellent result. It turns out that residents of the Indian capital receive less harm to their health. And that's great news.
It should be noted that in a few months the airbecame cleaner in other large cities of our planet. In Austrian Vienna, substances that are destructive to the human body have become 60% less. The Chinese city of Shanghai, too, could not be called clean, but even there the air became fresh by as much as 42%. Now, guess when exactly the air began to clear? Of course, after the announcement of quarantine due to the coronavirus pandemic.
See also: Has the air around the world become cleaner due to the SARS-CoV-2 pandemic?
The impact of coronavirus on nature
Nature really has an opportunityget rid of harmful substances. And all because many factories have closed, people have stopped driving and, in general, just started to sit at home. And is it worth talking about it? We ourselves sat on our sofas for several months, watching memes like "nature has cleared so much that dinosaurs returned to the streets." And we could only go to the store for food, and after that we spent a few minutes wiping the food with antiseptics.
According to one of the authors of the study, PrashantKumar (Prashant Kumar), some people are no longer surprised by air purification during the quarantine period. But this news is worth looking at from a different angle - just think how much harmful substances humanity produces in ordinary times. Every morning, hundreds of thousands of cars drive their owners to work and pollute the air with exhaust gases. People use aerosols and throw away cigarette butts, plastic bottles and other garbage at almost every step. If the waste is thrown into the bin, then smoking trucks are still used to transport it. And in landfills this garbage is burned - tons of harmful substances are again thrown into the air. And this happens in every city in the world. But there are about 2.3 million urban settlements on our planet.
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On the importance of fresh air, I recommendread an article by Lyubov Sokovikova about lung function in the human body. She spoke in detail about how our respiratory system works, why it is needed and what lung diseases are. She also touched on the topic of maintaining lung health, so everyone should read this material. Don't forget to share the link with your family and friends!