Cyclone Arnab and Western Disturbance Bring Rain Forecast and Air Quality Hope to Delhi

Rain is forecast in Delhi as moisture from Cyclone Arnab interacts with a western disturbance, according to the India Meteorological Department (IMD). The weather agency issued a yellow alert for the capital, indicating that very light to light rain, thunder, and lightning are likely at a few places on October 29, 2026.

At 9:31 am on October 29, Delhi's Air Quality Index (AQI) stood at 363, reflecting continued high pollution levels. Readings between October 22 and 28 showed sharp daily fluctuations, ranging from around 140 in afternoons to well above 330 at night, as daytime sun helps pollutants spread while evening settings cause smog to settle.

Weather Systems and Forecast

• Active Systems: A western disturbance over northwest Uttar Pradesh interacting with moisture from Cyclone Arnab.
• IMD Alert: A yellow alert urging residents to stay updated.
• Wind Forecast: Gusty winds of 30 to 50 kmph expected on October 29.
• Precipitation Timeline: Rain forecast for October 29 and October 30, followed by partly cloudy skies over the weekend.

Practical Implications for Air Quality

Rain can potentially wash airborne particles down, and stronger winds may disperse pollutants. However, the IMD notes that sustained improvement is not guaranteed and depends on rainfall volume, duration, wind direction, and atmospheric mixing.

• Temporary Relief: Showers and winds may offer short-term respite from heavy smog.
• Persistent Sources: Daily pollution from vehicles, construction, and road dust will continue to accumulate unless long-term measures are addressed.

Readers can verify official updates and yellow alerts directly through the India Meteorological Department's official channels and local bulletin publications.