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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 28: Kolkata Metro Rail Corp expects to complete its East-West project, which runs partly under the city’s iconic Hooghly river, by March 2022 after a delay of several years doubled costs.

The authority is awaiting a final installment of Rs 20 crore ($2.8 million) over the next two years from the Indian Railway Board, said Manas Sarkar, managing director at KMRC. A soft loan of Rs 4,160 crore from Japan International Cooperation Agency helps fund 48.5% of the project.

India’s oldest metro, which started in 1984 with a North-South service, was due to expand by 2014 but faced problems including squatters on the planned route. These issues have contributed to the total project cost rising to about Rs 8,600 crore for some 17 kilometers from Rs 4,900 crore for 14 km.

“About 40% of total transport demand will be tackled by these two metro services,” Sarkar said in an interview at his office in Kolkata. “It will be a relief for environmental pollution and the city should be much more decongested.”

The new line is expected to carry about 900,000 people daily, -- roughly 20% of the city’s population -- and will take less than a minute to cross a 520-meter underwater tunnel. Depending on the time of day, it takes some 20 minutes to use the ferry and anywhere upward of an hour to cross the Howrah bridge.

KMRC will repay the JICA loan over 30 years after an initial six-year moratorium. The interest rate is between 1.2% to 1.6%. The East-West metro project is 74% owned by the railway ministry and 26% by the ministry of housing and urban affairs.

“We don’t anticipate any further cost escalation now,” Sarkar said.

Kolkata, Jan 12: Prime Minister Narendra Modi on Sunday announced that Kolkata Port Trust will be renamed as Syama Prasad Mukherjee Port.

Addressing the gathering at the inauguration of 150th anniversary celebrations of Kolkata Port Trust, he said: "I announce the renaming of the Kolkata Port Trust to Dr Shyama Prasad Mukherjee Port. He is a living legend who was a leader for development and fought on the forefront for the idea of One Nation, One Constitution."

"This port represents industrial, spiritual and self-sufficiency aspirations of India. Today, when the port is celebrating its 150th anniversary, it is our responsibility to make it a powerful symbol of New India," Modi said.

The Prime Minister said that the Bharatiya Jana Sangh founder had set the stone for industrialization in India. "Chittaranjan Locomotive Factory, Hindustan Aircraft Factory, Damodar Valley Corporation and several others saw active participation from him," he said.

The Prime Minister also felicitated the two oldest pensioners of the Kolkata Port Trust, Nagina Bhagat and Naresh Chandra Chakraborty.