Not winter, yet Delhi-NCR cities record 'severe' AQI in morning
The Air Quality Index (AQI) in several Delhi-NCR cities has been slipping into the "severe" category in the early morning hours, causing concerns among health-watchers.

The Air Quality Index (AQI) in several Delhi-NCR cities has been slipping into the "severe" category in the early morning hours, causing concerns among health-watchers.
An all-India winter air quality analysis for 2021-2022 carried out by the Centre for Science and Environment determined that in the northern Indian region, Delhi-NCR remained the most polluted sub-region with the worst days here being almost five times the average elsewhere.
The home secretary stressed that the health infrastructure in all districts of Delhi-NCR should be immediately strengthened to be able to deal with any enhanced requirement, an official statement said.
The survey said 10% of Delhi-NCR respondents have "four or more individuals" in their family or close network impacted by the viral disease. Also 19% said they have "two to three individuals", and 15% said only "one individual" has been affected in their family.
The survey conducted by LocalCircles also said that 91 per cent of Delhi residents believe authorities were completely or partially ineffective in enforcing the ban on transportation, distribution and sale of crackers this Diwali.
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Low wind speed and falling temperatures have been cited by the Met Department as reasons for such AQI readings. Calm winds and low temperatures trap pollutants close to the ground, while favourable wind speed helps in their dispersion.
The cost of the test, which can give results in 6-7 hours, will be based on the respective state government guidelines. The main advantages are its affordability, relative ease of use, and non-dependency on expensive Q-PCR machines.
Delhi recorded an air quality index (AQI) of 397 at 11 am on Thursday. The 24-hour average AQI was 297 on Wednesday, 312 on Tuesday, 353 on Monday, 349 on Sunday, 345 on Saturday, and 366 on Friday.
Years of exposure to high levels of pollutants has left people in Delhi-NCR with structural changes in lungs that may cause respiratory problems in future.
In deaths, Delhi’s share is even higher. The national capital contributes 91.5% of the deaths and is followed by Gurgaon, Faridabad, Ghazaibad, Gautam Buddha Nagar and Sonepat, in that order (see graph).