21.   This ban was imposed because the practice releases ammonia, a catalyst in the conversion of atmospheric sulphur dioxide into sulphate, thus accelerating the formation of acid rain.

22.   The trading opened when the Environmental Protection Agency auctioned off permits to emit sulphur dioxide.

23.   RME, which produces no sulphur dioxide and less carbon dioxide than diesel, is used in France, Germany, Italy, Spain and Austria.

24.   Both ozone and nitrogen dioxide can cause breathing problems for people with lung complaints, while sulphur dioxide dissolves in water to form acid rain.

25.   Data available from analyses done in the community show measured concentrations of pollutants such as sulphur dioxide and nitrogen dioxide well below EEC guidelines.

26.   Apart from general operating conditions, it has set emission limits for sulphur dioxide, nitrogen dioxide and carbon monoxide.

27.   Other substances monitored during the trials included sulphur dioxide, ozone, toluene and paraxylene...

28.   Emissions of sulphur dioxide around the Taj Mahal are twice the permissible levels.

29.   Lead, carbon dioxide and sulphur dioxide in the air are down.

30.   Moreover, windmills do not emit sulphur dioxide, which causes acid rain, and carbon dioxide, the most widespread greenhouse gas.