Why did Delhi's air quality worsen despite recent rainfall?

Despite significant rainfall, Delhi's air quality deteriorated to 'very poor' because the rain's intensity was insufficient to effectively cleanse fine PM2.5 particles, and pre-existing pollution levels also contributed.

What was the temperature like in Delhi during the recent showers?

During the recent showers, Delhi's maximum temperature dropped sharply to 16.9°C, over 6 degrees lower than the previous day, contributing to a colder feel despite the ongoing winter.

When is Delhi's air quality expected to improve?

Air quality in Delhi is forecast to improve to 'poor' on Wednesday, January 29, though it may deteriorate back to 'very poor' by January 30.

Home / Weather / Delhi Rains Fail to Clear Toxic Air

Delhi Rains Fail to Clear Toxic Air

28 Jan

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Summary

Delhi experienced its wettest January in four years with significant rainfall.
Despite rain, air quality deteriorated to 'very poor' levels.
Maximum temperature dropped sharply, but a 'cold day' was not declared.

Delhi and its surrounding areas experienced widespread rainfall on Tuesday, resulting in a significant decrease in daytime temperatures. The capital's maximum temperature dropped to 16.9°C, a fall of over 6 degrees Celsius in a single day. This January has been the wettest in four years, with 25.3mm of rain recorded at Safdarjung so far this month.

Despite the precipitation, the city's air quality deteriorated into the "very poor" category by evening. The rain, described as not intense enough to cleanse finer PM2.5 particles effectively, contributed to this outcome. While the maximum temperature saw a sharp decline, a "cold day" was not declared as specific criteria, requiring consecutive days of low temperatures, were not met.

The India Meteorological Department forecasts a return to dry weather, with northwesterly winds expected to lower nighttime temperatures later in the week. Air quality is predicted to improve to "poor" on Wednesday but may return to "very poor" by January 30.