NGT imposes Rs 100 crore fine on Meghalaya govt for failing to curb illegal mining

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.

The Jamaat-e-Islami Hind (JIH) has urged Muslims to take precautions during Eid ul-Adha (Bakrid), to be celebrated in the last week of July, and has issued guidelines on offering prayers and sacrifices.

"The namaz should be offered by adhering to the social distancing norms at eidgahs and mosques. Muslims should offer the Eid prayer at home in the same manner as they had done during Eid ul-Fitr in areas where restrictions have been imposed due to COVID-19," it said.

For the sacrifice of animals, a part of the festival, the JIH said "precautionary" measures should be taken due to the pandemic.

"Don't offer qurbani on roads, footpaths and pathways. Ensure the highest level of cleanliness and hygiene. Ensure that you bury the blood and entrails of the animal after qurbani or deliver it at the designated spot of garbage collection," the JIH said in a statement.

The JIH said it would be appropriate to form a committee few days before the Eid ul-Adha, which would keep an eye on the situation, remain in touch with the local administration and offer cooperation towards maintaining the law and order in the area.

Thiruvananthapuram, Mar 23: Amid a spurt in coronavirus cases, Kerala chief minister Pinarayi Vijayan has asked the Centre to give the states authority to give clearances for manufacturing masks, gloves and sanitisers.

In a letter addressed to prime minister Narendra Modi, Vijayan said during the crisis, masks and sanitisers are needed in large numbers.

"As an interim, states must be given authority to give clearances of manufacturing of items related to medical devices, sanitisers, chemicals, etc. which are needed for fighting Covid-19," Vijayan said in the letter.

He also sought permission for the state home department to use drones for the relevant applications related to Covid-19.

"In China and elsewhere in the world, drones have been used extensively in minimising human contact, disinfection, etc. Unfortunately, with the current laws pertaining to the use of drones, none of these is possible in India," the chief minister said.

He also sought permission to access and use facilities available with all central institutions and research labs operating in the state.

The chief minister shared the letter on his Twitter handle.

With 15 new positive cases of Covid-19, the total number of infected persons in Kerala had gone up to 67, including the three who were discharged after recovery last month.