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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.

New Delhi, Jan 31: Chief Economic Adviser K V Subramanian on Friday said India's GDP is expected to grow at 6-6.5 per cent next fiscal as the economic slowdown has bottomed out.

As per the first advance estimates released by the National Statistical Organisation (NSO), the country's economic growth is likely to hit an 11-year low of 5 per cent in the current fiscal ending March 2020.

The Economic Survey 2019-20, prepared by a team lead by Subramanian, has projected the GDP to expand in the range of 6-6.5 per cent during 2020-21.

The Indian economy has hit the bottom and it will see an uptick from here, he said in a media briefing post the Economic Survey.

Amidst a weak environment for global manufacturing, trade and demand, the Indian economy slowed down with GDP growth moderating to 4.8 per cent in the first half of 2019-20, lower than 6.2 per cent in H2 of 2018-19.

Based on NSO's first advance estimates of GDP growth for 2019-20 at 5 per cent, an uptick in GDP growth is expected in the second half of the fiscal, it said.

According to it, the uptick in second half of 2019-20 would be mainly due to ten positive factors like picking up of Nifty India Consumption Index for the first time this year, an upbeat secondary market, higher FDI flows, build-up of demand pressure, positive outlook for rural consumption, rebound of industrial activity, steady improvement in manufacturing, growth in merchandise exports, higher build-up of foreign exchange reserves and positive growth rate of GST revenue collection.

The survey also emphasised that merger of public sector banks may increase the financial strength of the merged entities, lower the risk aversion and result in lowering of lending rates.

Further, as the implementation of GST further settles down, the increased unification of the domestic market may reduce business costs and facilitate fresh investment.

Reforms in land and labour market may further reduce business costs, said the survey, presented a day before Sitharaman's Union Budget 2020-21.

New Delhi, Jan 17: Deputy Chief Minister Manish Sisodia does not have any car on his name, according to information shared in the poll affidavit filed by him for Delhi elections.

In the affidavit, it is also shown that while his self-acquired immovable property remained roughly the same as in 2015. His wife's self-acquired immovable property is worth roughly about Rs 65 lakh, as per his latest affidavit.

In the papers submitted during the nomination for 2015 Delhi polls, the senior AAP leader had declared that he owned a Maruti Swift car of make 2013.

However, in his 2020 affidavit, he has mentioned "nil" in the column for motor vehicles and other means of transport.

In the affidavit submitted on Thursday, his moveable assets were declared worth Rs 4,74,888 for 2018-19, as against Rs 4,92,624 for 2013-14.

In 2015, Sisodia had informed in his affidavit that he had bought a property in Vasundhara, Ghaziabad, worth Rs 5.07 lakh in April 2001. The approximate current market value of self-acquired property in 2015 was Rs 12 lakh.

In his current affidavit, the AAP leader has mentioned the same property. However, the approximate current market value of self-acquired property in 2020 has increased to Rs 21 lakh.

In his affidavit for the 2015 polls, Sisodia had also said that his wife had purchased a property in March 2008 costing Rs 8.70 lakh. At that time, the approximate value of her self-acquired property was Rs 20 lakh.