Which of the following is a dangerous product of coal burning?

Sulphur dioxide is a dangerous product of coal burning. When coal is burned, it releases sulphur dioxide, a gas that can cause serious health and environmental problems. Sulphur dioxide can react with other chemicals in the air to form acid rain, which can damage crops, forests, and waterways. In addition, sulphur dioxide can cause respiratory problems in humans, including asthma and bronchitis. It is therefore important to control the amount of sulphur dioxide released during coal burning through the use of pollution control technologies.