Smog is a common air pollutant that reduces visibility. The term combines smoke and fog. Smog is dangerous to humans, animals, and plants. Smog is unpleasant because it creates a blurry atmosphere. It makes the sky appear gray or brown. Smog protection is always a must due to the increased risks of road accidents since smog makes it difficult for people to travel and drive. Smog is common in large cities with many factories and heavy traffic. Smog protection is essential to stay safe from health problems.