The correct answer is: C. Sulphurous smog
Sulphurous smog is a type of air pollution that is caused by the burning of fossil fuels that contain sulphur. It is a brownish-yellow haze that can be seen in the air, and it can cause respiratory problems in humans and animals.
Acid fumes are a type of air pollution that is caused by the burning of fossil fuels that contain sulphur. They are a mixture of sulphur dioxide and other gases, and they can cause respiratory problems in humans and animals.
Photochemical smog is a type of air pollution that is caused by the reaction of sunlight with pollutants in the air. It is a brownish-orange haze that can be seen in the air, and it can cause respiratory problems in humans and animals.
Industrial smog is a type of air pollution that is caused by the burning of fossil fuels in factories and power plants. It is a brownish-grey haze that can be seen in the air, and it can cause respiratory problems in humans and animals.