Apple is over, like people all over the world protected from Covid-19 epidemic, Indian Express newspaper published a photo spread on Twitter, showing a slightly dark blue sky in Uttar Pradesh, the most populous country in northern India. On top of a flower trellis, the tiny white peaks of the Himalayan Mountains appear on the surface like solid whips. Pawan Gupta, senior scientist at the Universities Space Research Association at NASA Marshall Space Flight Center, says friends and relatives in India have told him that the mountains have not been visible for years. The reason is simple: Before the plague, the air was filled with smoke.
The Guptas are studying air pollution in India, and like many other scientists, they are studying how the restrictions have reduced air pollution on urban areas. “This is a natural experiment for many of us,” says Gupta. A natural experiment that has proven one thing above all else – air can change, and speed.
Mu published research This March in Established Cities and Society, Gupta and his colleagues thought for three months – March to May 2020 – when travel, construction, and factories outside hospitals were banned. They compared air pollution to more than six major cities – Bengaluru, Chennai, Delhi, Kolkata, Mumbai, and Pune – and the same in the last three years. Using satellite imagery, they found a 42 to 60% drop in microbes and a 46 to 61% drop in nitrogen dioxide (NO)2), dangerous air pollutants.
A little story, scientists mean soot, a mixture of soil, dust, smoke, and allergens. The tiniest particles enter human lungs and blood vessels, causing an increase in asthma, heart disease, and even death. No.2 they are made with fat burning oil, and have the potential to develop asthma and increase the risk of respiratory infections.
Gupta’s colleague Christoph Keller, chief scientist of the same research institute at NASA, has also monitored air pollution in cities. Because Keller’s research, published in Atmospheric Chemistry and Physics in March, he made the first computer launch at the global NO2 releases would be in 2020 without any problems. He then used it to try to track real air in cities around the world, including Melbourne, Taipei, and Rio de Janeiro. The results showed NO worldwide2 a decrease of about 20%, and 50 of the 61 cities surveyed showed a decrease of between 20 and 50 percent. In particular, Wuhan, China, showed a 60% decrease; in New York City, it was 45 percent.
“One of the lessons we can learn from this epidemic is that there is a great opportunity to lower NO2 quantity, “says Keller.” What we see best in urban areas is not much of NO2 these are man-made products that we can gradually reduce. ”
A recent study found the same thing. Marco Carnevale Miino, technical professor at the University of Pavia in Italy, 22sanayese NO2 multiplied in three European cities. They were found to be as low as 80.8% in London, 79.8% in Paris, and 42.4% in Milan between last March and May, which is consistent with the road slowdown caused by travel restrictions. In Santiago, Chile, researchers have been investigating air pollution in urban areas in the same three months I compare them with the same period in the last three years. They also found that the amount of material and NO2 was reduced. 22In Portugal, researchers found that NO2 fell by 41 percent and other items fell by 18 percent during March-to May compared to the last five years. Researchers in the United Kingdom learned No.2 data from January to June, 2020, I also noticed that the amount decreased anywhere from 32 to 50% during the closing period and gradually increased again with the return of traffic.