The acid rain test Author Swift B. Journal/Series The Environmental Forum | Vol. 14(3); 17 - 25; 9 p. Date 1997 Source IUCN (ID: ANA-060726) Publisher | Place of publication Environmental Law Institute | Washington, DC, USA Language English Country/Territory United States of America Subject Air & atmosphere Keyword Subsidy/incentive Acid precipitation Emission standards Abstract The emissions cap and allowance trading system for sulfur dioxide has improved the environment while lowering compliance costs. Performance standards in a cap and trading system could help reduce other pollutants, such as ozone and greenhouse gases