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New Delhi, Mar 24: Nearly 500 coronavirus cases have been reported in India so far, according to Health Ministry data on Tuesday.

According to the data updated Tuesday morning, the total number of COVID-19 cases rose to 492, including 446 active cases.

The figure includes 41 foreign nationals and the nine deaths reported so far, the Health Ministry said.

West Bengal and Himachal Pradesh reported a casualty each on Monday while seven deaths were earlier reported from Maharashtra (two), Bihar, Karnataka, Delhi, Gujarat and Punjab.

Thirty-seven people have been cured/discharged/migrated, it added.

The number of active cases at 446 saw an increase of 22 from last night's figure.

As cases of the viral infection surged, authorities have put almost the entire country under lockdown, banning gathering of people and suspending road, rail and air traffic till March 31.

Kerala has reported the highest number of COVID-19 cases so far at 95, including eight foreign nationals, followed by Maharashtra which recorded 87, including three foreigners, according to the ministry data.

Karnataka has reported 37 cases of coronavirus patients, while cases in Rajasthan increased to 33, including two foreigners.

Uttar Pradesh has 33 positive cases, including a foreign national.

Telangana has so far reported 32 cases, including 10 foreigners.

Cases in Delhi rose to 31, including one foreigner, while Gujarat has reported 29 cases.

In Haryana, there are 26 cases, including 14 foreigners, while Punjab has reported 21 cases.

Ladakh has 13 cases, while Tamil Nadu has reported 12 cases, including two foreigners.

West Bengal, Madhya Pradesh and Andhra Pradesh have reported seven cases each so far.

Chandigarh has six cases, while Jammu and Kashmir has four cases.

Uttarakhand and Himachal Pradesh have reported three cases each, while there are two cases each in Bihar and Odisha.

Puducherry and Chhattisgarh have reported a case each.

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, Mar 22: The central government on Sunday decided to suspend all metro train services across the country till March 31 in view of coronavirus outbreak.

In a message to managing directors of all metro train corporations, Union Housing and Urban Affairs Secretary Durga Shanker Mishra said this is being done in continuation of suspending metro services during 'Janta Curfew'.

"In view of the current global pandemic of this Corona Virus & for containing its further spread through inter-personal proximity, it has been decided to close down metro rail services on all operational networks across the country till 31 March 2020," Mishra tweeted.

In another tweet, he said by the act of social distancing, people can protect themselves and their dear ones, and win the fight against COVID-19.

India reported three more coronavirus deaths on Sunday, including the first casualty from Bihar, taking the toll to seven and the number of COVID-19 cases rose to 341, officials said.