New Delhi, Jan 7: The staff operating the smog tower at Connaught Place here shut it down on Sunday over alleged non-payment of their salaries, according to sources.

However, an official of the Delhi government said that the Delhi Pollution Control Committee (DPCC) in December sanctioned funds to the project management consultant, NBCC (India) Limited, for the payment of salaries to the staff of Tata Projects Limited (TPL), who operate the smog tower.

"The staff of Tata Projects Limited raised concerns about delayed salary payments, and the Delhi government cleared the dues in December. The NBCC, responsible for disbursing funds to Tata Projects Limited, failed to do so due to non-submission of utilisation certificates," the source said.

Sources said the DPCC will hold a meeting with the NBCC and TPL regarding the issue on Wednesday.

In 2021, two smog towers were installed in Delhi - one at Connaught Place under the DPCC and another at Anand Vihar under the Central Pollution Control Board (CPCB) - following directives from the Supreme Court.

The smog tower at Connaught Place was temporarily shut down based on unilateral directions from the chairman of the DPCC, Delhi Environment Minister Gopal Rai had claimed earlier. It was restarted in November following orders from the apex court.

According to the CPCB data, during the 2021-22 winter season, the smog tower at Anand Vihar reduced PM2.5 concentration by up to 17 per cent and PM10 levels by up to 27 per cent within a 100-metre radius.

Last year, the Delhi government said that the Connaught Place smog tower could decrease air pollution by 70 to 80 per cent within a 50-metre radius and by 15 to 20 per cent up to 300-metre radius.

In November, the DPCC informed the National Green Tribunal (NGT) that the two experimental smog towers in the city were ineffective in reducing air pollution. The operation of these costly giant air purifiers lacks merit, according to a report submitted to the NGT by the pollution control body.

Nadita Moitra, a senior scientist at the DPCC, said in the report that the Rs 25-crore smog tower at Connaught Place, operational for two years, can only mitigate air pollution by up to 17 per cent within a 100-metre radius.

Considering Delhi's vast area of 1,483 square kilometres, the pollution control body highlighted the need for more than 47,000 such towers, each costing Rs 25 crore for installation and requiring Rs 15 lakh monthly for operation and maintenance.

The DPCC report argued that achieving a mere 17 per cent reduction within a 100-metre radius, with a one-time cost of Rs 25 crore and a recurring cost of Rs 10 to 15 lakh per month is "not at all justified. It is not even a drop in the ocean".

It concluded that both towers were experimental, and their results did not warrant the heavy expenditure.

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New Delhi (PTI): The National Investigation Agency (NIA) on Sunday registered a case to probe recovery of 79 crude bombs in poll-bound West Bengal, officials said.

The move came following a directive by the Union Home Ministry in this regard, they said.

In pursuance to the home ministry's order, the anti-terror agency on Sunday registered a case, which was originally filed at Uttar Kashi police station, Bhangar division, Kolkata on Saturday, and took up the investigation, an NIA spokesperson said in a late night statement.

"The case pertains to recovery of 79 crude bombs and other incriminating materials by Kolkata police, which were being stored at a spot, thereby endangering human life and property," the spokesperson said.

Earlier in the day, the Election Commission had directed the West Bengal Police to launch a special drive to arrest those involved in illegal manufacturing of crude bombs in the poll-bound state, an official said.

It asserted that all cases related to the making of any such explosive would be probed by the National Investigation Agency, the official said.

The directive came after the police recovered a large number of crude bombs from the house of a person, allegedly a TMC worker, at Bhangar in South 24 Parganas district, days ahead of the second and final phase of the assembly polls in the state.

The explosives were recovered during a search at the residence of Rafikul Islam following specific inputs, the official said.

The poll panel also issued a warning to senior police officers across the state over any lapse in maintaining law and order before the April 29 polling.

The first phase of the assembly elections in West Bengal was held on April 23, while the second phase will take place on April 29. Votes will be counted on May 4.

A record 93.19 per cent turnout has been recorded in the first round of polling. Bhangar will vote in the second phase.