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November 11, 2019 / 09:40 AM IST

Air Pollution Updates: High humidity keeps Delhi's air quality 'very poor'

Updates: Air quality index has marginally improved over the last few days. However, it remains in poor in most parts of Delhi-NCR

Delhi breathed easier on November 6 as pollution levels dropped further due to clearer skies and moderate wind speed though weather experts feared a cloud cover at night and light drizzle could lead to deterioration of air quality.

The government's air quality monitoring and forecasting service, SAFAR, said though Punjab recorded the season's highest farm fire count of 6,668 on Tuesday, its impact on Delhi's air quality will be negligible due to a change in the wind direction.

At 1.30

pm, the city's overall air quality index read 216, which falls in the poor category. At many places, the pollution levels dropped to "moderate" category.

The levels of PM2.5 -- tiny particulate matter less than 2.5 microns in diameter that can enter into the lungs and even the bloodstream -- dropped to 107 micrograms per cubic metre (ug/m3) in the Delhi-NCR region.

The PM10 concentration was 226 ug/m3 at 1.30 pm.

The safe levels of PM2.5 and PM10 are 60 and 100 ug/m3, respectively.

A senior scientist at India Meteorological Department (IMD) said pollution levels will drop further during daytime due to clearer skies and moderate winds.

"However, a cloud cover, very light rains, clam winds are expected at night which may accelerate accumulation of pollutants and air quality may deteriorate slightly," the IMD official said.

The situation will improve again on Thursday due to strong winds and rains. Delhi is expected to breathe comparatively cleaner air till November 10, he said.

SAFAR said, "Delhi's overall AQI has improved significantly, more rapidly than predicted, and further

The Supreme Court-mandated Environment Pollution (Prevention and Control) Authority had on Monday extended the restrictions on hot mix plants, stone crushers and dirty fuel-based industries in Delhi-NCR till the morning of November 8 expecting a repeat of Sunday's episode.

The Supreme Court had also banned construction activities in Delhi-NCR till further orders.

On Sunday, pollution level in Delhi peaked to a three-year high as high humidity due to light rains on Saturday led to formation of more potent secondary particles.

Secondary particles are product of complicated atmospheric reactions between primary particles - such as particulate matter, sulphur dioxide and nitrogen dioxide directly emitted by stubble burning and vehicles - in the presence of other factors such as sunlight and moisture.

Examples of secondary particles include sulphates, nitrates, ozone and organic aerosols.

An AQI between 0-50 is considered 'good', 51-100 'satisfactory', 101-200 'moderate', 201-300 'poor', 301-400 ’very poor' and 401-500 ’severe'. An AQI above 500 falls in the severe plus category.
  • November 08, 2019 / 11:09 AM IST

    Delhi's air 'very poor' on November 8

    The air quality in Delhi kept under 'very poor' category today morning because of high humidity, officials said.
    The city received 8 mm rainfall till 8.30 am in past 24 hours and relative humidity was 94 per cent, a MeT department official said.
    The air quality index (AQI) of Delhi was 350 at 9 AM, according to Central Pollution Control Board (CPCB).
    An AQI between 201 and 300 is 'poor', 301-400 'very poor' and 401-500 'severe' while the AQI above 500 falls in the severe plus category. (PTI)

  • November 08, 2019 / 08:53 AM IST
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  • November 07, 2019 / 06:19 PM IST

    Delhi's air quality 'very poor' again due to high humidity

    After a brief relief, the national capital's air quality plunged to the "very poor" category again on Thursday due to high humidity because of light rains, officials said.

    Weather experts said high humidity and light winds affect dispersion of pollutants and lead to the formation of more potent secondary particles. Secondary particles are products of complicated atmospheric reactions between primary particles, such as particulate matter, sulphur dioxide and nitrogen dioxide directly emitted by stubble burning and vehicles, in the presence of other factors such as sunlight and moisture. 

    Examples of secondary particles include sulphates, nitrates, ozone and organic aerosols. 

    Delhi's overall air quality index read 309 at 4.45 pm. It was 217 at 9 pm on Wednesday. The air quality also took a hit in neighbouring Noida (328), Ghaziabad (325), Greater Noida (318), and Faridabad (312). 

    – PTI

  • November 07, 2019 / 03:52 PM IST

    AQI in various parts of Delhi-NCR at 3.52 pm:

    Anand Vihar, Delhi: 360
    Sector 62, Noida: 336
    Punjabi Bagh, Delhi: 283
    Jawaharlal Nehru Stadium, Delhi: 319
    Vasundhara, Ghaziabad: 330

  • November 07, 2019 / 03:26 PM IST

    Vijay Goel, BJP leaders protest outside Dy CM Sisodia's residence

    In his protest against stubble burning, BJP MP Vijay Goel today carried crop residue on a bicycle to Delhi Deputy Chief Minister Manish Sisodia's residence and accused AAP MLAs in Punjab of encouraging the practice.

    Goel, along with Delhi BJP leaders, staged a protest outside Sisodia's residence on Mathura Road. "We are carrying paddy stubble for Sisodia in a protest against his government's failure to do anything to curb air pollution in Delhi and the role of AAP MLAs in Punjab behind stubble burning," the senior BJP leader said.

    Delhi CM Arvind Kejriwal and AAP leaders have been blaming stubble burning in Punjab for the rising pollution levels in the national capital. (PTI)

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  • November 07, 2019 / 02:54 PM IST

    AQI in various parts of Delhi-NCR at 2.54 pm:

    Anand Vihar, Delhi: 443
    Sector 62, Noida: 443
    Punjabi Bagh, Delhi: 229
    Jawaharlal Nehru Stadium, Delhi: 309
    Vasundhara, Ghaziabad: 445

  • November 07, 2019 / 02:00 PM IST

    Two factories fined in Muzaffarnagar for creating pollution

    Two factories in Muzaffarnagar, Uttar Pradesh have been fined over Rs 3.3 lakh for allegedly not using anti-pollution equipment.

    A team of the pollution control board today checked seven factories and imposed a fine of Rs 1.6 lakh on JK Carbon Pvt Ltd and Vinayak Industries each.

    Meanwhile, the authorities have ordered to stop the construction activities in the district to check pollution.

  • November 07, 2019 / 01:30 PM IST

    Delhi weather update: Indian Meteorological Department (IMD) has forecast a generally cloudy sky with possibility of very light rain, and thundershowers during the day time today.

    The maximum temperature is expected to be 28 degrees while the minimum was 17 degrees Celsius.

  • November 07, 2019 / 01:10 PM IST

    AQI in various parts of Delhi-NCR at 1.10 pm:

    Anand Vihar, Delhi: 260
    Sector 62, Noida: 260
    NISE, Gurugram: 228
    Jawaharlal Nehru Stadium, Delhi: 332
    Vasundhara, Ghaziabad: 256

  • November 07, 2019 / 12:11 PM IST

    “There is a socio-politics behind the debates over air pollution and it exposes a prevalent class divide. By vilifying the farmers in Punjab and Haryana, the AAP-led Delhi administration, and to a large extent the mainstream media, has reinforced the idea of environmental classism,” public policy analyst Dharmesh Shah writes for Moneycontrol.

    Read the full opinion piece here: Where’s the equity while proposing solutions to Delhi’s smog?

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  • November 07, 2019 / 11:52 AM IST

    AQI in various parts of Delhi-NCR at 11.52 am:

    Anand Vihar, Delhi: 254
    Sector 62, Noida: 260
    NISE, Gurugram: 228
    Jawaharlal Nehru Stadium, Delhi: 271
    Vasundhara, Ghaziabad: 278

  • November 07, 2019 / 11:10 AM IST

    In this tweet from ANI: Visuals of stubble burning from Talwara village in Ludhiana district, Punjab.

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