Pollution When winter arrives in Lahore, so does the deterioration in visibility. What gives? Smog In Lahore Is Sometimes Mistook For Fog. Smog is a form of air pollution that can impair one's ability to see clearly. It not only blocks sightlines but also poses a threat to all forms of life. Exactly what is smog, then? The dangers of smog, as well as measures you can take to safeguard your health, will be discussed at length.