Vehicular pollution is responsible for fog formation on the motorway in Pakistan.Scientist in Peshawar say that particles coming from vehicular pollution form nuclie which in turn on combination with water present in the air for fog.This fog is a big hurdle for traffic on the motorway in Pakistan.This fog is also responsible for throat irritation,drop in visibility and results in accidents and closure of the motorway.

Principal Scientific Officer Shahid Faruq informed in his radio interview that the chemicals present in the fog in the presence of light rays react and lead to photochemical reactions and their products are skin sensitive. These vehicular pollutants and their products also contribute to green house effects and climatic changes.
to listen the interview please click the link

https://docs.google.com/file/d/0B87OgyFMP4RgR3B4ZHFFa2VycXc/edit?usp=sharing