Washington, Apr 23: Air pollution over northern India has plummeted to a 20-year-low for this time of the year, according to satellite data published by US space agency National Aeronautics and Space Administration (NASA).
The US space agency's satellite sensors observed aerosol levels at a 20-year low post the countrywide lockdown, implemented to slow the spread of the novel coronavirus.
"We knew we would see changes in atmospheric composition in many places during the lockdown," said Pawan Gupta, a Universities Space Research Association (USRA) scientist at NASA''s Marshall Space Flight Center. "But I have never seen aerosol values so low in the Indo-Gangetic Plain at this time of year," added Mr Gupta.
Acting Assistant Secretary of State for South and Central Asia Alice G Wells tweeted, "These images from NASA were taken each spring starting in 2016 and show a 20-year low in airborne particle levels over India. When India and the world are ready to work and travel again, let's not forget that collaborative action can result in cleaner air."
The data published with maps show aerosol optical depth (AOD) in 2020 compared to the average for 2016-2019. Aerosol optical depth is a measure of how light is absorbed or reflected by airborne particles as it travels through the atmosphere.
If aerosols are concentrated near the surface, an optical depth of 1 or above indicates very hazy conditions. An optical depth, or thickness, of less than 0.1 over the entire atmospheric vertical column is considered "clean." The data were retrieved by the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA's Terra satellite.
In the first few days of the lockdown, it was difficult to observe a change in the pollution signature. "We saw an aerosol decrease in the first week of the shutdown, but that was due to a combination of rain and the lockdown," said Mr Gupta.
Around March 27, heavy rain poured over vast areas of northern India and helped clear the air of aerosols. Aerosol concentrations usually increase again after such heavy precipitation.
"After the rainfall, I was really impressed that aerosol levels did not go up and return to normal. We saw a gradual decrease and things have been staying at the level we might expect without anthropogenic emissions," Mr Gupta said.
On March 25, the Indian government placed its 1.3 billion citizens under a strict lockdown to reduce the spread of COVID-19. The countrywide mandate decreased activity at factories and severely reduced car, bus, truck and airplane traffic. Every year, aerosols from anthropogenic (human-made) sources contribute to unhealthy levels of air pollution in many Indian cities.
Aerosols are tiny solid and liquid particles suspended in the air that reduce visibility and can damage the human lungs and heart.
In southern India though, the story is a little hazier. Satellite data show aerosol levels have not yet decreased to the same extent. In fact, levels seem to be slightly higher than in the past four years. The reasons are unclear but could be related to recent weather patterns, agricultural fires, winds or other factors.
"This a model scientific experiment," Robert Levy, program leader for NASA's MODIS aerosol products, said about the lockdown and its effects on pollution.
"We have a unique opportunity to learn how the atmosphere reacts to sharp and sudden reductions in emissions from certain sectors. This can help us separate how natural and human sources of aerosols affect the atmosphere," Mr Levy added.
Comments
First teach your own men to stop intolerance.
Are you people blind not seeing surge in oppression of poor.
You don't want people to raise their concern when you do all harms to poor and minorities.
Teach patriotism and tolerance to your own men.
Teach them to Denounce Godse who killed the father of Nation who gave you an identity to call you as proud Indian.
Muslims do not need any extra teaching from others.
They have full guidance from their God
Now if you are a true concerned of your nation, then at least learn what is teaching of Islam, just adapt in your routine life.
RSS should come forward to punish the killer of mahatma gandhi. They should ban Nathuram Godse's supporters.
RSS founder and its founding members already proved their patriotism during the time of India's freedom struggle!! We Muslims in India proved our patriotism from Shaheed Tippu Sultan\s time till now, we no need any advice from RSS. A Muslim is not a complete Muslim unless he is not patriotic to his country where he/she live, this is our Prophet's word."
Dear Mr. Indresh Kumar,
Please make sure that loving one's country and its people is a good traits of the Muslims as our beloved Prophet Muhammed (peace be upon him) has said: \Love of your country (patriotism) is a part of your faith.
Never be under the opinion that Madarasas are not teaching patriotism. We love our country as you love.
Patriotism is love of one's country, loyalty and devotion to it, desire to grow and prosper collectively or as a community, and you need to understand that we muslims are being dignified citizens of India proud to say that many of our patriotic ancestors have sacrificed their blood and life during the freedom struggles of our great nation. Please make sure that Islam does not forbid a Muslim to love his homeland or the country in which he lives or grows up.
Almighty Allah says: \"O Mankind! we have created you from a male and a female, and made you into nations and tribes, that you may know one another. Verily the most honorable of you with Allah is that (believer) who has Taqwa, Muttaqoon (pious)\". Verily Allah is all knowing all aware (Quran Chapter Hujuraat, verse No. 13).
May God help all of us to live in peace in this great Nation, INDIA."
RSS should learn what is PATRIOT not the muslims or madrasa childrens.
RSS - Stop making communal voilences,bomb explosions and divie an disturbences in the society.
Preach the patriotism to thier affialitaions like VHP, Bajrangees and Goodaisms groups.
ont question Muslims patriotism.
Yes thats why you are alive.....................
we know how to LOVE our country ,Quran teaches us very nicely , we are all patriotic Indian muslims, our country is our home
Muslims love India more than you do......unlike Nathuram Godse who killed Gandhiji....
Killer of Mahatma Gandhi speaking of Patriot..
No Need Advice from RSS For Muslim
Love your country is part of islam .....
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