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Chandigarh experienced its second-most polluted day of the year as the Air Quality Index (AQI) dipped into the "very poor" category, following closely after Diwali. At 6 pm, the average AQI at the Continuous Ambient Air Quality Monitoring Station (CAAQMS) in Sector 53 was 340, while at Sector 22 CAAQMS, it measured 304. These values fall within the "very poor" range (AQI between 301-400).

Factors contributing to poor air quality:

The UT environment director, TC Nautiyal, attributed the worsening AQI to a temperature drop creating a high-pressure area, hindering winds and preventing pollutants' dispersal. The Sector 53 station, affected by garbage burning in parts of Punjab, recorded the poorest air quality. Sector 22 showed higher AQI due to its central location and increased commercial activities. Sector 25 offered the most representative picture of the city's air quality.

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In the "very poor" bracket, prolonged exposure to such AQI levels can lead to respiratory illnesses. The absence of winds and the non-movement of colder North Westerly winds further contributed to the stagnant air. The recent Western Disturbance had temporarily raised temperatures.

Weather outlook:

The Indian Meteorological Department extended the orange alert for dense fog due to high humidity and anticipated temperature drops. The maximum temperature on Monday fell to 22.6°C, with a minimum of 7.8°C. Over the next three days, temperatures are expected to hover around 24°C (maximum) and 8°C (minimum). 

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In summary, Chandigarh faces heightened pollution concerns attributed to weather conditions and local factors, necessitating measures for air quality improvement.