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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.

Thiruvananthapuram, April 5: Kerala Health Minister KK Shailaja on Sunday said that the state's preparations for containment of COVID-19 were satisfactory and added that PCR tests were going on in nine laboratories, in which upwards of eight thousand samples have been tested so far.

"Our strategy for the containment of COVID-19 is satisfactory. We are yielding good results from our strategy for tracing, isolation, testing & treatment. PCR test is going on in 9 laboratories. We have tested more than 8000 samples so far," Shailaja told ANI here.

She further said that the state government wanted to implement Rapid test in Kerala and added that they had ample PPEs and N95 masks.

"We want to implement Rapid Test in Kerala. Yesterday, we got 2000 kits; Right now, we have sufficient PPEs and N95 masks. If the number of COVID19 cases increases in the coming weeks then we will need more equipment," Shailaja said.

Keeping up with the need of the hour, the new administrative block of Kasaragod Medical College will soon be converted into a COVID-19 hospital for providing better treatment facilities to the coronavirus patients.

A team constituting 26 doctors and medical staff of the Government Medical College, Thiruvananthapuram will join the efforts of converting the new administrative block into a COVID-19 Hospital in Kasaragod on Sunday.

The total number of COVID-19 positive cases rose to 3,374 in India on Sunday, as per the data provided by the Ministry of Health and Family Welfare.

New Delhi, Jun 25: Diesel price in the national capital crossed the Rs 80 per litre-mark for the first time ever on Thursday as oil companies raised prices for the 19th day, taking the cumulative rate to Rs 10.63 a litre.

Petrol price, after a day's hiatus, was hiked by 16 paise and the increase in less than three weeks now totals Rs 8.66 per litre.

Petrol price in Delhi was hiked to Rs 79.92 per litre from Rs 79.76, while diesel rates were increased to Rs 80.02 a litre from Rs 79.88, according to a price notification of state oil marketing companies.

Diesel had for the first time become costlier than petrol in Delhi on Wednesday and has now crossed the Rs 80 per litre-mark.

Rates differ from state to state depending on the incidence of value-added tax (VAT).

However, diesel is costlier than petrol only in the national capital where the state government had raised local sales tax or VAT on the fuel sharply last month. It costs less than petrol in other cities.

The 19th daily increase in rates since oil companies on June 7 restarted revising prices in line with costs after ending an 82-day hiatus in rate revision, has taken diesel prices to fresh highs.

In 19 straight days, diesel price has gone up by Rs 10.63 per litre. Petrol price has been hiked on 18 occasions since June 7 and now totals to Rs 8.66 a litre.