What is Sulfur Dioxide (SO 2 ) SO 2 is a criteria pollutant specified in the Clean Air Act It is a pungent gas that is unhealthy to breathe High levels of SO 2 can cause or worsen respiratory ailments & aggravate existing heart disease Children, the elderly & other sensitive groups are most affected by exposures to high levels of SO 2 Damages vegetation & materials such as buildings Contributes to the formation of particle pollution and acid rain 2
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