Cop killed in stone-pelting after PM's rally

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, May 12: A total of 12 special evacuation flights from across the globe will bring home stranded Indians on the sixth day of 'Vande Bharat Mission' on Tuesday.

The special flights include Air India flight from Manila to Ahmedabad, London to Hyderabad, Newark-Mumbai-Ahmedabad, AI flight from Singapore to Delhi, AI flight from Dhaka to Srinagar, Dammam to Kochi, Kuala Lumpur to Mumbai, Manila to Delhi, Muscat to Chennai, Dubai to Kannur, Dubai to Mangalore and Singapore-Bengaluru-Kochi.

Amidst the coronavirus pandemic, India is conducting 'Vande Bharat' Mission -- its biggest ever repatriation exercise since independence -- to bring back stranded Indians from abroad, including from the US, the UAE and the UK.

On the fifth day of Vande Bharat Mission, as many as 1,667 Indian nationals were repatriated from different countries in eight special flights.

Allahabad, Mar 1: Shabista Khan, wife of suspended pediatrician Dr Kafeel Khan, fears that her husband's life is in danger.

In a letter written to the chief justice of the Allahabad High Court and senior government authorities, Shabista has sought security for her husband who is lodged in Mathura jail for allegedly delivering provocative speech during anti-CAA protest at Aligarh Muslim University.

"My husband is being mentally tortured in jail and is being subjected to inhuman behaviour," Shabista wrote in her letter to the chief justice of Allahabad High Court, additional chief secretary (home) and director general (jail), among others.

She said that she apprehended that an attempt could be made on her husband's life in jail and demanded adequate security for him.

She also demanded that her husband should be kept away from active criminals and lodged with common prisoners.