According to the railways, 22 Delhi-bound trains were delayed by one to six hours due to weather-related conditions in Delhi and different States. The IMD said there will be shallow to moderate fog in the coming week, with the possibility of a cloudy sky and light rains on January 9. The Air Quality Index (AQI) was recorded at 341 ‘very poor’ at 10 a.m., according to the Central Pollution Control Board (CPCB).