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Mumbai, Apr 14: The Shiv Sena and NCP said Prime Minister Narendra Modis address to the nation on Tuesday lacked substance as he did not suggest ways to strengthen the economy or a relief package for the poor and those worst hit by the lockdown.

Shiv Sena spokesperson Manisha Kayande also took a dig at the prime minister, saying he thankfully did not give any activity to people this time like clanging utensils or lighting lamps.

Modi on Tuesday announced that the lockdown across the country will be extended till May 3, saying the measure has produced a significant outcome in containing the infection.

He said implementation of the lockdown will be strictly ensured in its second phase and detailed guidelines will be brought out on Wednesday to ensure that outbreak does not spread to new areas.

Some relaxations may be allowed after April 20 in places where there are no hotspots, he said.

Kayande said Modi could have announced extension of the lockdown on Wednesday itself along with the new guidelines, instead of declaring it separately.

"He could have elaborated steps to be taken to tackle the coronavirus, relaxing restrictions on movements in different areas (depending upon threat posed by the disease)," she said.

"His speech normally is more of a rhetoric than substance. Thankfully, he did not give any other event to the people like lighting up lamps or clanging utensils. There was nothing substantial (in the address), the only takeaway was that the lockdown has been extended, she added.

Maharashtra Minister and NCP national spokesman Nawab Malik noted that Modi talked about helping the poor.

"But, he could have announced a package on behalf of the central government to help the poor, those working in the unorganised sector who are the worst hit due to the lockdown.

There was no mention of it anywhere," Malik said.

Another NCP spokesman Mahesh Tapase said it was expected that the prime minister would address the economic concerns being faced by the country.

"The least to expect was the announcement of a slew of measures to kick-start the economy in a phased manner as and when the restrictions are lifted, he added.

Tapase said the employers and employees wanted to know from the government how recession and unemployment will be tackled in the time to come.

"Access to capital for business, especially for MSMEs and agriculture, is a big concern. Supply and logistics is the cornerstone of economic activity which has come to a virtual standstill," he said.

The 2020-21 fiscal looks grim and hence, the right stimulus from the government coupled with a renewed zeal by the industry will only bring the economy back on track, he suggested.

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.