Sulphur dioxide levels in the atmosphere can be reduced by using:

Sulphur dioxide (SO₂) emissions primarily come from burning fossil fuels that contain sulfur. Using low-sulphur fuels reduces the amount of sulfur burned, thereby directly decreasing SO₂ emissions. Other options: Catalytic converters mainly reduce NOx, CO, and hydrocarbons, not SO₂; electrostatic precipitators remove particulate matter, not gases; more efficient car engines reduce overall fuel consumption but do not specifically target sulfur content.