ISRO launches record 20 satellites in one go

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.

Thiruvananthapuram, Apr 26: Kerala Chief Minister Pinarayi Vijayan on Saturday urged media houses not to resort to layoffs and pay cuts while the whole community is facing the COVID-19 pandemic.

The Chief Minister said the state government will also take necessary steps to test the media personnel in the state to ensure they have not contracted the deadly virus.

He also pointed out that the pandemic has severely impacted the media sector with many newspapers even reducing the number of pages.

"Journalists are among those who have been affected the most. Journalists on the field are also in danger. We have come to know about the reporters affected with coronavirus in other states. The government will take necessary precautions including testing to ensure that journalists don't contract the disease," Vijayan said.

He said the newspapers were not receiving advertisements these days because there are no social or public events resulting in less commercial activities in the society.

"I would like to urge the media houses not to engage in layoffs or salary cuts during this pandemic. Journalists are working shoulder to shoulder with health workers. During this pandemic, scribes are out in the field collecting news, despite the threat of disease and it was admirable," Vijayan said.

The chief minister said the government has asked the PRD to release the dues to various media houses.

Mumbai, Jan 18: Maharashtra Tourism Minister Aaditya Thackeray on Friday said shops, restaurants, malls and pubs will remain open 24 hours on an experimental basis in a few areas of Mumbai from January 26.

The areas where these establishments will remain open all night are Fort and Kala Ghoda in south Mumbai and Bandra Kurla Complex in the west.

Thackeray had batted for all-night-open eateries and other establishments in the city during the earlier BJP-Shiv Sena regime too.