New Delhi(PTI): A layer of smog shrouded Delhi-NCR on Thursday and partially blotted out the sun on Chhath Puja as the air quality slipped back into the severe zone with unfavourable meteorological conditions aiding accumulation of pollutants, authorities said.

Green think tank Centre for Science and Environment (CSE) said the ongoing smog episode is a public health emergency.

"This requires urgent emergency action on key combustion sources (vehicles, industry, waste burning) and dust sources (construction and roads) to prevent further trapping of pollution when there is no wind to blow this away," said Anumita Roychowdhury, executive director, research and advocacy, CSE.

At 10 am, Delhi recorded an Air Quality Index (AQI) of 407. Thirty-three of the 39 air quality monitoring stations in the national capital recorded air pollution levels in the severe category.

The 24-hour average AQI was 372 on Wednesday.

Ghaziabad (454), Greater Noida (404) and Noida (426) also recorded severe air quality at 10 am.

An AQI between zero and 50 is considered "good", 51 and 100 "satisfactory", 101 and 200 "moderate", 201 and 300 "poor", 301 and 400 "very poor", and 401 and 500 "severe".

An official from the India Meteorological Department (IMD) said shallow fog and low temperatures in the morning -- Delhi recorded the season's lowest temperature of 12.6 degrees Celsius on Thursday -- trapped pollutants close to the ground and calm winds led to stagnant conditions.

Visibility levels at the Indira Gandhi International Airport and the Safdarjung Airport dropped to 600-800 metres, he added.

The CSE said the current severe smog episode in Delhi-NCR is expected to last for two more days.

It also said the average daily contribution of smoke from farm fires from the middle of October to November 8 was the lowest in four years.

"Compared to the first smog episode of the previous four years, the current smog has matched the duration of the first smog of 2018 and 2020 season -- both lasted six days. If conditions do not improve, it might overtake the 2019 smog that lasted eight days," the CSE said.

The longer duration of this year's smog despite relatively windier local conditions might be due to a lack of pollution control measures in the city, the green think tank said.

On an average, the contribution of smoke to Delhi's daily PM2.5 from the middle of October to November 8 was the lowest in the last four years.

"So far, it has recorded an average of 12 per cent (farm fire share) per day in contrast to 17 per cent per day in 2020, 14 per cent per day in 2019 and 16 per cent per day in 2018 (as reported by SAFAR)," the CSE said.

The share of farm fires in Delhi's pollution rose to 48 per cent on Sunday, the highest since November 5, 2018, when it was recorded at 58 per cent.

Last year, the share of stubble burning in Delhi's pollution had peaked at 42 per cent on November 5. In 2019, crop residue burning accounted for 44 per cent of Delhi's PM2.5 pollution on November 1.

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Udupi: Three people were held by the Udupi Town Police on Tuesday for allegedly duping a person of Rs 8.5 lakh by promising a seat for a Master of Public Health (MPH) course in the United Kingdom.

The police have arrested Suman S (24) of Hosanagar in Shivamogga and Suhan Khan (22) and Mohammad Mahaz (23) from Moodbidri, and seized cash of Rs 5 lakh along with an SUV and two mobile phones that were being used by the arrested trio, reports Times of India.

The fraud victim, Santhosh E, who filed the police complaint on January 9, told the police that he had obtained a degree in General Medicine. Hoping to study further in the UK, traveled to Dubai, where he met Aftab and agreed to pay Aftab Rs 18 lakh to get a seat in the UK for a Master’s degree. Santhosh was initially asked by Aftab to pay Rs 8.5 lakh for a confirmation of the seat, but, as the complainant did not have a Non-Resident Account (NRA), Aftab asked him to contact an acquaintance, Suman S in Udupi. During the meeting with Suman near the MTR Hotel in Moodanidambur village in Udupi, Santhosh handed over Rs 8.5 lakh.

After the process, however, Aftab avoided Santhosh’s calls, said the complainant, adding before the police that he had been deceived with the promise of the MPH seat in the UK.

The Udupi Town Police team, led by Inspector Ramachandra Nayak and Sub-inspector Eeranna Shiragumpi, probed the case, along with SIs Puneet Kumar and Bharatesh, among other personnel, and arrested the accused Aftab and Suman. They have also held Mahaz under charge of involvement in the case.

The arrested men have been presented before the court.

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