The largest change in the energy industry's emissions in Oklahoma from 1995 to 2015 was the decrease in sulfur dioxide emissions. In 1995, sulfur dioxide emissions from the energy industry in Oklahoma were approximately 1,800,000 tons, and by 2015, they had decreased to around 500,000 tons. This represents a significant reduction of 1,300,000 tons in sulfur dioxide emissions over the 20-year period.
