Delhi residents woke up to a foggy morning on Saturday as very dense fog engulfed parts of Delhi-NCR which resulted in the delay of at least 24 trains travelling in and around the national capital. The dense fog also led to a delay in at least 80 flights to and from Delhi due to the fog and low visibility. Delhi airport authority stated that due to dense fog, only CAT IIIA and CATIII B compliant aircraft and pilots can operate. Passengers have asked to contact the airline concerned for updated flight information. The thick fog in the national capital region led to low or zero visibility in parts of Delhi.