16
Sulfur Dioxide - SO2
nMajor sources
•Coal and Oil -fired power plants
nEffects
•Respiratory distress
•Formation of acid deposition
•Particle formation
•Visibility
nTrends
•U.S. average concentration down
50% over past 20 years
50% over past 20 years
•All urban areas meet standard
•Watersheds in northeast U.S. acidified
•Cost of CAIR allowances
will drive new controls
will drive new controls
