Wind brings down pollution levels in Delhi, still in ‘severe’ category

Pollution
levels in Delhi and neighbouring cities dropped marginally on Saturday with a
slight increase in the wind speed, a day after the region recorded its worst
air quality forcing authorities to shut schools, ban all construction
activities and declare a public health emergency.

The city’s
overall air quality index (AQI) stood at 407 at 10 am. It was 484 at 4 pm on
Friday, according to official data.

In the
National Capital Region (NCR), Ghaziabad and Greater Noida recorded AQIs of 459
and 452, respectively, at 10 am on Saturday. On Friday, they had an AQI of 496
at 4 pm, the Central Pollution Control Board (CPCB) said.

The levels of PM2.5 — tiny particulate matter of less than 2.5 microns in diameter that can enter the lungs and even the bloodstream, were 269 micrograms per cubic meter at 10 am, more than four times the safe limit of 60 micrograms per cubic meter. The PM10 level was at 436, showed official data.

Weather
experts said there is a significant improvement in wind speed and it will
increase gradually. Winds gusting up to 20-25 kilometers per hour are likely in
the region from Sunday to Tuesday, they said.

Scattered
rainfall in Punjab, Haryana, Rajasthan and Delhi is likely on November 7 and 8
under the influence of Cyclone Maha and a fresh western disturbance, the
weather office said.

Chief
Minister Arvind Kejriwal termed Delhi a “gas chamber” and blamed
stubble burning in neighbouring Haryana and nearby Punjab for the apocalyptic
haze shrouding the city.

The share of
stubble burning in Delhi’s pollution stood at 46% on Friday, the highest so
far, according to the Ministry of Earth Science’s air quality monitor, SAFAR. The
AQI entered the ‘severe plus’ or ’emergency’ category late Thursday night in
Delhi, the first time since January this year.

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’. Above 500 falls in
the ‘severe plus’ category.