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New Delhi, Jul 18: The Covid-19 lockdown-led reduction in air pollution levels across five Indian cities, including Delhi and Mumbai, may have prevented about 630 premature deaths, and saved USD 690 million in health costs in the country, according to a new study.

Scientists, including those from the University of Surrey in the UK, assessed the levels of harmful fine particulate matter (PM2.5) from vehicles and other sources in five Indian cities -- Delhi, Mumbai, Kolkata, Chennai and Hyderabad -- since the beginning of the lockdown period.

The study, published in the journal Sustainable Cities and Society, compared these lockdown PM2.5 figures from 25 March up until 11 May, with those from similar periods of the preceding five years, and found that the measure reduced pollution levels in all these places.

According to the scientists, during this period, the levels of these harmful air pollutants reduced by 10 per cent in Mumbai, and by up to 54 per cent in Delhi.

"The percentage reduction for the other cities ranged from 24 to 32 per cent, which was slightly smaller than the measured values for Delhi and Mumbai," the scientists noted in the study.

"While the reduction in PM2.5 pollution may not be surprising, the size of the reduction should make us all take notice of the impact we have been having on the planet," said Prashant Kumar, a co-author of the study from the University of Surrey.

The scientists said these reductions in PM2.5 were comparable to those reported in other cities across the world, such as in Austria's capital Vienna (60 per cent), and Shanghai (42 per cent) in China.

They also calculated the monetary value of the reduced mortality due to air pollution and found that the lowered levels of PM2.5 may have saved 630 people from premature death, and USD 690 million in health costs in India.

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According to the researchers, the present lockdown situation offers observational opportunities regarding potential control systems and regulations for improved urban air quality.

They said an integrated approach might help in understanding the overall impacts of Covid-19 lockdown-style interventions and support the implementation of relevant policy frameworks.

"This is an opportunity for us all to discuss and debate what the 'new normal' should look like - particularly when it comes to the quality of the air we breathe," Kumar said.

New Delhi, Jun 9: Petrol price on Tuesday was hiked by 54 paise per litre and diesel by 58 paise a litre - the third straight daily increase in rates after oil PSUs ended an 82-day hiatus in rate revision.

Petrol price in Delhi was hiked to Rs 73.00 per litre from 72.46, while diesel rates were increased to Rs 71.17 a litre from Rs 70.59, according to a price notification of state oil marketing companies.

This is the third daily increase in rates in a row. Oil companies had on Sunday restarted revising prices in line with costs, after ending an 82-day hiatus.

Prices were raised by 60 paise per litre each on both petrol and diesel on Sunday as well as on Monday. In all, petrol price has gone up by Rs 1.74 per litre and diesel by Rs 1.78 a litre in three days.

Oil PSUs - Indian Oil Corp (IOC), Bharat Petroleum Corp Ltd (BPCL) and Hindustan Petroleum Corp Ltd (HPCL) - had put daily price revisions on hold soon after the government on March 14, hiked excise duty on petrol and diesel by Rs 3 per litre each.

Oil companies did not pass on that excise duty hike, as well as the May 6 increase in tax on petrol by Rs 10 per litre and Rs 13 a litre hike on diesel by setting them off against the decline in retail prices that should have effected to reflect international oil rates falling to two-decade low.

International rates have since rebounded and oil companies having exhausted all the margin are now passing on the increase to customers, an industry official said.