Residents of the national capital experience a much-needed break this week as the air quality improves in Delhi after light rain from a western disturbance, bringing a short respite from the usual winter smog. Due to an active western disturbance over northwest India, light rain and thunderstorms occurred in some parts of the national capital and its surrounding areas on Friday, a weather pattern which usually results in rain and snow in the northern plains.

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How Rain Impacted Air Quality

Fresh data from the Central Pollution Control Board (CPCB) showed that the Air Quality Index (AQI) was around 297 at 8 am, which was a minor improvement from previous readings of over 312. However, most local monitoring stations were still at poor to very poor levels, and this minor enhancement was widely accepted as the first visible indication that the pollution and the thick smog of the past few days were finally subsiding.

The lower levels of humidity from light showers, along with high winds and thunder, seem to promote this effect, especially for fine particulate matter (PM 2.5) that is most dangerous to humans. Increased wind speed and humidity also helped disperse and elevate additional pollutants, improving visibility and providing some short ‑term comfort for residents.

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Public Response and Daily Life

Major smog reduction and primary roads became less polluted were among the reports of people who grumbled about the air quality before and now see the good air quality. School and outdoor employees, who were instructed to be very careful about staying outdoors for long periods due to poor air quality prior to this, now resume their normal activities.

Thunder, wind, and light rain seem to be the main reasons that the very fine particles of dust are being washed away, as well as the way these particles are dispersed by the wind. Also, the increased mixing of the atmosphere caused by the thunder has helped to increase the elevation of ground-level pollutants and thereby improve visibility in the city.

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Forecast and What Comes Next

Meteorologists claim that western disturbances are significant factors in producing winter precipitation in northern India, and they create cold snaps and short episodes of snowfall in the Himalayas, but tend to produce limited air quality benefits by removing smoke and dust particles from the western plains after periods of rain. However, as the dry weather returns, the potential for rapid build-up of air pollution will also return for Delhi’s atmosphere.

The air quality improves in Delhi after light rain, removing smoke and dust particles from the western plains. On the other hand, once the dry weather sets in, the possibility of air pollution building up very quickly will definitely be back in Delhi’s atmosphere.

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