Delhi Air Quality: AQI Hits 97 Following Rain and Strong Winds

The national capital and its surrounding National Capital Region (NCR) experienced a major respite from atmospheric pollution due to a change in weather patterns, while following widespread rainfall on Sunday and subsequent high-speed winds, Delhi's air quality improved drastically on Monday. According to data released by the Central Pollution Control Board (CPCB), the 24-hour average Air Quality Index (AQI) in Delhi dropped to 97. This marks a rare instance this year where the city's air quality has transitioned into the 'satisfactory' zone, providing much-needed relief to residents. The rain effectively washed away suspended particulate matter, while the winds prevented further accumulation of pollutants.

Factors Driving the Improvement in Air Quality

Meteorological experts attribute this significant drop in pollution levels to two primary natural phenomena. The first is the 'washout effect' caused by the rainfall on Sunday. 5 and PM10 to the ground. The second factor is the increased wind speed following the rain. These winds helped in the rapid dispersion of localized pollutants that usually remain trapped near the surface during stagnant weather conditions. If the average AQI remains in the 'satisfactory' range throughout Monday, it will be recorded as the cleanest air day for the city in recent months.

Station-Wise Temperature and Meteorological Observations

The rainfall has also influenced the thermal profile of the city. 3°C above the seasonal average. 8°C above normal). 7°C above normal). These variations reflect the localized impact of cloud cover and moisture levels across different parts of the metropolitan area.

Rainfall Distribution and Regional Data Analysis

According to the India Meteorological Department (IMD), the cumulative rainfall recorded in the 24 hours ending at 8:30 AM on Monday showed varying intensities across the city. 4mm of rain. 8mm respectively. While Palam and the Ridge areas saw trace amounts of rainfall, the overall atmospheric moisture and wind patterns were consistent across the region. This precipitation, though light in volume, was sufficient to clear the haze and improve horizontal visibility Notably.

CPCB Air Quality Classification and Standards

The Central Pollution Control Board (CPCB) categorizes air quality based on specific numerical brackets, while an AQI between 0 and 50 is considered 'Good', while 51 to 100 is classified as 'Satisfactory'. The 'Moderate' category ranges from 101 to 200, 'Poor' from 201 to 300, 'Very Poor' from 301 to 400, and 'Severe' from 401 to 500. Delhi's current reading of 97 indicates that the concentration of pollutants is low enough to pose minimal health risks to the general population. Environmental officials noted that the sustained wind speed is a crucial factor in maintaining these levels, as it prevents the stagnation of vehicular and industrial emissions.