New Delhi, Feb. 18 -- : Cold wave coupled with heavy rain and hailstorm are likely to sweep across Delhi on Monday evening, a private weather forecasting agency said.

"Due to the presence of one after another active Western disturbance, rain and thundershowers will occur over Delhi-NCR between February 18 to 22. On 21 February, rains will increase over the region and during that time, we expect moderate rains accompanied with hailstorm activity over entire Delhi-NCR," said Skymet.

Due to the presence of light to moderate winds, air quality has shown marginal improvement with the Air Quality Index (AQI) docking at 204 in the morning, which falls in the 'poor' category, said state-run System of Air Quality and Weather Forecasting And Resear...