Chandigarh, Jun 13: Former Indian women volleyball team captain Nirmal Kaur, who is the wife of sprint legend Milkha Singh, died at a Mohali hospital due to complications related to COVID-19 infection she had contracted last month.

She was 85 and is survived by his husband, one son and three daughters.

"We are deeply saddened to inform you that Mrs Nirmal Milkha Singh passed away after a valiant battle against COVID at 4 PM today," a statement from the spokesperson of the Milkha family said.

"A back bone of the Milkha Family, she was 85 years old. It is tragic that the Flying Sikh Milkha Singh ji could not attend the cremation which was conducted this evening itself as he is still in the ICU (of PGIMER in Chandigarh) himself."

Nirmal was brought to Fortis Hospital at Mohali on May 26, two days after Milkha was admitted to the same facility due to COVID-pneumonia.

Milkha was discharged on the request of the family a week later but Nirmal remained at the hospital, batting the dreaded infection. Milkha was later admitted to the Intensive Care Unit (ICU) of PGIMER here and he is currently "stable and continues to improve".

A former Director of Sports for Women in the Punjab Government and ex captain of the Indian national volleyball team, Nirmal had fought a valiant battle till the very end, the family spokesperson said.

"The family has expressed its grateful thanks to everyone for their solidarity and prayers right through the battle which gave them the strength to face it bravely."

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New Delhi, Nov 13: Delhi recorded the country's worst air quality on Wednesday as it turned 'severe' for the first time this season, with the AQI soaring to 418.

Bihar's Hajipur, with an Air Quality Index (AQI) of 417, had the the second-worst reading in the country, Central Pollution Control Board (CPCB) data showed.

Of Delhi's 36 monitoring stations, 30 reported air quality in the 'severe' category, the CPCB said.

In comparison, the national capital's 24-hour average AQI -- recorded at 4 pm every day -- stood at 334 on Tuesday.

An AQI between zero and 50 is considered 'good', 51 and 100 'satisfactory', 101 and 200 'moderate', 201 and 300 'poor', 301 and 400 'very poor', 401 and 450 'severe' and above 450 'severe plus'.

According to the CPCB data, the city's AQI was in the 'severe' category for three days in January.

On January 14, the AQI was recorded at 447, followed by 409 each on January 24 and 26.

The CPCB said 'severe' AQI affected healthy people and seriously impacted those with existing medical conditions.

The air quality in the national capital had been in the 'very poor' category since it plunged to the level on October 30.

According to the Centre's Decision Support System for Air Quality Management, vehicular emission was the top contributor to Delhi's pollution, with an estimated share of approximately 13.3 per cent.

The other prominent pollutants were PM2.5 and PM10.

PM2.5 and PM10 refer to fine particulate matter in the air, with the numbers indicating their size in micrometres.

PM2.5 are fine particles with a diameter of 2.5 micrometres or less, about the width of a human hair. These are so small that these can penetrate deep into the lungs and even enter the bloodstream, posing significant health risks.

PM10 are coarser particles with a diameter of 10 micrometres or less, about the width of 10 human hairs. While not as concerning as PM2.5, these can still irritate the airways and worsen respiratory problems.

Long-term exposure to these particulate matter can increase the risk of heart disease.