As many as 29 trains are running late due to low visibility in the Northern Railway region.
However, no flight operations have been affected.
"Travel safe, travel stress-free! There is a moderate fog outside. All flight operations are normal. Passengers are requested to contact the airline concerned for updated flight information," said Delhi Airport in a statement.
Commuters faced traffic snarls as a thin layer of fog enveloped the national capital on Wednesday morning.
The India Meteorological Department (IMD) has predicted that there will be no more cold wave in Delhi till January 4 and there might be a slight rise in temperatures.
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