Reducing acid rain

One of the primary causes of acid rain is emissions of sulphur dioxide (SO2) from power stations and other large combustion plants.

In 1985, twenty-one countries signed the Helsinki Protocol to reduce their emissions of SO2 to not more than 70% of their 1980 levels by 1993. According to the 1994 Progress Report on the US-Canada Air Quality Agreement, both countries have pledged to reduce their SO2 emissions at 40% below 1980 levels by the year 2000. The USA is expected to begin SO2 emission reductions in 1995.

1. Reducing pollution

1. Using nuclear power
2. Monitoring toxic rain

1. Acidic precipitation

1. Toxicity

1. The bittersweet story of how we stopped acid rain