evidence: IMD issues red alert: Very dense fog in U.P. for 2 days IMD, the country’s nodal weather agency, has advised people to avoid travel during the morning and evening hours as visibility in some districts of the state will drop to zero metres. The season’s worst fog across swathes of north India led to a pile-up of at least 12 vehicles on the Delhi-Agra Yamuna Expressway at Dayanatpur village in Uttar Pradesh’s Greater Noida on Wednesday. [...] The season’s worst fog across swathes of north India led to a pile-up of at least 12 vehicles on the Delhi-Agra Yamuna Expressway at Dayanatpur village in Uttar Pradesh’s Greater Noida on Wednesday.