As dense fog enveloped Delhi on Saturday, 15 trains were reportedly cancelledand 34 trains were runninglate due to low visibility.
Four trains had to berescheduled by the Railways.
According to reports, most trains running on Amritsar/Ludhiana to New Delhi route were running late or had to berescheduled.
At8:30am(local time) the visibility in Delhi was recorded at 800 meters.
On December 20, 54 trains were delayed and 12 were rescheduled. Around ten cars had collided on the Lucknow-Agra expressway due to low visibility in Uttar Pradesh.
As fog engulfedDelhi, air quality was recorded at PM 205 at 242, PM 10 at 233 inLodhi Road area, which comes in the "severe"category.
The national capital's air quality has been dropping since Friday.
In November, Delhi's air quality haddropped to the lowest level on the Air Quality Index forcing the government to shut down schools and halt construction work in the capital and adjoining areas.