According to the India Meteorological Department (IMD), Delhi's Safdarjung base station has logged 31.52 mm of rainfall this month, far below the July normal of 209.7 mm. The back‑to‑back rain spells have cleared the capital's air, bringing the Air Quality Index (AQI) down to a record low of 59 on Wednesday afternoon, placing it in the ‘Satisfactory’ band.

Impact of the Rainfall

The showers have not only washed away dust and particulate matter but also alleviated water‑logging in many parts of the city. The Ridge weather station recorded 54.3 mm in the last 24 hours, raising July's total to 79.1 mm—about 154% above the seasonal average. Nearby stations such as Ayanagar and Gurgaon reported 51 mm and 83 mm respectively, both well above their long‑term normals.

Air‑Quality Statistics

Data from the Central Pollution Control Board (CPCB) show that the previous low this year was 73 on June 12, making the current reading a significant improvement. In July, Delhi recorded ‘Satisfactory’ AQI (51‑100) on three days, while the remaining days fell in the ‘Moderate’ range (101‑200). June also saw three ‘Satisfactory’ days, but the monthly average AQI stood at 141, underscoring the sharp drop this month.

Temperature Decline and Health Implications

At Safdarjung, the maximum temperature settled at 30.8°C, 5.8°C below the seasonal norm and 6.4°C lower than Tuesday’s peak. The minimum dipped to 25.4°C, 4.6°C cooler than the previous day. Gurgaon experienced a dramatic 9.4°C fall in maximum temperature, with minima dropping up to 4.8°C. Such sudden cooling can aggravate respiratory ailments, prompting health officials to advise the elderly, children, and those with pre‑existing conditions to take precautions.

Yellow Alert and Potential Storms

The IMD has issued a yellow alert for Thursday, indicating the likelihood of light rain, thunderstorms, and occasional gusty winds. The alert cites a well‑defined low‑pressure system over north‑west Madhya Pradesh and south‑west Uttar Pradesh, together with favourable conditions for the further advance of the south‑west monsoon. Consequently, the forecast calls for generally cloudy skies with intermittent showers throughout the day.

Looking Ahead

If the current rain pattern persists, Delhi could see a sustained improvement in air quality, but industrial emissions and vehicular exhaust remain major challenges. Experts argue that short‑term weather relief must be complemented by long‑term policies—stricter emission standards, expansion of green cover, and promotion of public transport—to transform the capital into a genuinely clean‑air metropolis.