Delhi air quality very poor again, studies show less pollution by cars

Heavy smog in the next few days forecast by weather bureau

GN Bureau | December 19, 2015



As Delhi government prepares to unveil its plan to restrict vehicles with an aim to reduce pollution in the capital, air quality in Delhi is once again in the category of ‘very poor’ and is likely to stay that way over the weekend.

In Delhi, the average levels of particulate matters (PM 2.5 and PM 10) – fine particles that can enter into the respiratory system and cause damage – were, respectively, 218 and 359 micrograms per cubic metre as opposed to the safe limits of 60 and 100, an IMD official said. The World Health Organisation’s recommended maximum is 25.

WHO also considers the quantity of PM 2.5 as the best indicator of the level of health risks from air pollution.

“Air quality will fluctuate between poor and very poor. It is not as bad as last year due to fairly strong wind movement, essentially westerlies, which is aiding in dispersal of the suspended particulate matters,” said SK Peshin, deputy director general, Meteorology.

An IMD official said that the situation is expected to persist over the weekend.

However, there is no possibility of heavy smog in the next few days although the days to watch out are on December 20 and 21.

 The scheme of ‘odd-even’ restrictions on the movement of vehicles and other details that will come into force from January 1 are being worked out. The government will publish these measures next week.

Meanwhile, three studies have found that the actual culprit in winters is not vehicular emissions, reports Economic Times.

Two reports — one by former faculty members of Indian Institute of Technology, Delhi, and the other by US, Indian and University of Birmingham researchers — said wood smoke is the prime contributor to the presence of PM 2.5 — fine particles with a width of 2.5 microns or less — in the air in winters. According to the third study, power plants are the main source of this pollutant.

The first two studies also point out that the total number of cars on the road may be less than the 2.8 million that are registered in New Delhi. The actual number of private cars being run is only half of the vehicles that get registered, said former IIT-Delhi professor Dinesh Mohan. This is because vehicles are often not de-registered when they are trashed or sold, he said.

Mohan was part of the team that produced a report titled "Benchmarking Vehicle and Passenger Travel Characteristics in Delhi for On-road Emissions Analysis" after conducting the study over a three-year period that ended in 2014.

According to the report, wood smoke accounted for 23.3% of the PM 2.5 in winters and vehicular traffic 16.2%. "A number of brick kilns around Delhi bring in a lot of PM 2.5 mass to the city and are one of the leading sources for pollution," said Mohan.

Further, IIT-Delhi claims that so far, all studies on pollution in the national capital have been restricted to the city or parts of Delhi and have not taken areas in the National Capital Region into account. "There is a need for an integrated study on the air quality of Delhi to be conducted, which would also include NCR besides Delhi. We (IIT-Delhi) are in the process to conduct this," said a professor at IIT-Delhi, who along with other faculty members made a proposal to the Central Pollution Control Board and the Delhi Pollution Control Committee last week to conduct an integrated study in the region.

Meanwhile, a yet-to-be-released study by IIT-Kanpur holds power plants to be the main source of pollutants, contributing 30% of the total PM 2.5 mass in the city's air during winters. According to people working closely on the IIT-Kanpur study, the other sources are crop/bio-mass burning (26%) and diesel vehicular pollution (26%). Wood smoke is included in crop/bio-mass burning.

"In the summers, the fly ash (from construction and charcoal burning) is the main contributor to the high PM 2.5 levels in Delhi," said a person familiar with the IIT-Kanpur study.

Comments

 

Other News

A trowelful of empowerment

When her husband died last year, 60-year-old Chakkamma was not sure whether she would be able to have some money of her own: she has a son who looks after her, but she wanted to maintain a degree of independence. Opportunity came knocking when the Tamil Nadu government, as part of its Pudhu Vaazhvu (or new

Should Shiv Sena MP Ravindra Gaikwad be arrested for assaulting an Air India employee?

Should Shiv Sena MP Ravindra Gaikwad be arrested for assaulting an Air India employee?

Railways suffered over Rs 33,000 crore loss on passenger service: CAG

  The Railways was unable to meet its operational cost of passenger and other coaching services. During 2014-15, there was a loss of Rs 33,821.70 crore on passenger and other coaching services. The freight services earned a profit of Rs 38,312.59 crore which indicated that 88.28 percent

“Return land to tribals after mining is over”

Seasoned BJP parliamentarian Nand Kumar Sai, who took charge as the chairperson of the National Commission for Scheduled Tribes (NCST) on February 28, has his work cut out for him. Archana Mishra caught up with Sai, 71, on his first day in office where he

Should there be automatic termination as member of parliament if that person takes oath as minister/chief minister in a state?

Should there be automatic termination as member of parliament if that person takes oath as minister/chief minister in a state?

Ganga, Modi and people’s unwavering faith

When the truth was a few steps away from Modi’s gaze In November 2014, prime minister Narendra Modi made his first visit to his constituency Varanasi and launched a massive cleanliness drive at Asi ghat, which was covered in mud and silt. When locals sa

Video

Current Issue

Opinion

Facebook    Twitter    Google Plus    Linkedin    Subscribe Newsletter

Twitter