Delhi’s air quality is ‘bad’, no significant change likely

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IMD said the minimum temperature in Delhi is expected to drop to 9 degrees Celsius by Saturday.

New Delhi:

Air quality in Delhi deteriorated slightly and was recorded in the “poor” category on Wednesday, as a change in wind direction slightly increased the share of thatch in the city’s pollution.

The city’s Air Quality Index (AQI) was recorded in the “moderate” category in the morning. However, pollution levels increased slightly as the day progressed. The 24-hour average AQI was 211. It was 171 on Tuesday.

An AQI between zero and 50 is considered “good”, 51 and 100 “satisfactory”, 101 and 200 “average”, 201 and 300 “bad”, 301 and 400 “very bad” and 401 and 500 “serious”.

Weather experts and government agencies said no significant changes were likely in the next three to four days.

VK Soni, head of the Indian Meteorological Department’s environmental research center, said northwesterly winds slightly increased thatch’s contribution on Wednesday.

According to the air quality monitor of the Ministry of Earth Sciences, SAFAR, thatch burning accounted for eight percent of Delhi’s PM2.5 pollution on Wednesday. It was three percent Tuesday.

About 800 fire points were observed in Punjab, Haryana and western Pakistan. However, their impact on Delhi-NCR’s air quality will not be significant, Soni said.

The AQI will move to the “moderate” category again by Friday due to favorable wind speeds, he said.

The central government air quality early warning system for Delhi also said Delhi-NCR air quality will likely remain in the “moderate” category and the lowest in the “poor” category. Thursday and Friday.

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On Wednesday, the prevailing surface wind direction was northwest and the maximum wind speed was 10 km / h, he said.

The minimum and maximum temperatures were set at 10.6 degrees Celsius and 25.4 degrees Celsius, respectively.

Delhi’s ventilation index – a product of mixing depth and average wind speed – was around 5,000 square meters per second on Wednesday and is expected to be 7,500 square meters per second on Thursday.

The mixing depth is the vertical height at which the pollutants are suspended in the air. It decreases on cold days with calm wind speed.

A ventilation index of less than 6,000 square meters per second, with an average wind speed of less than 10 km / h, is unfavorable to the dispersion of pollutants.

The IMD said the minimum temperature in Delhi is expected to drop to 9 degrees Celsius by Saturday, as cold winds began to blow from the hilly areas, which witnessed a new wave of snow.

The minimum temperature this month, except Nov. 16, remained 2-3 degrees below normal in the absence of cloud cover, IMD officials said.

(Except for the title, this story was not edited by GalacticGaming staff and is posted from a syndicated feed.)

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