The graphs below show the overall decreases in emissions of certain pollutants at Quemetco over the last 20 years.
![Emissions Graphs Graphs of Quemetco Emissions to Present](/images/default-source/Compliance-Library/quemetco/emissions-graphs.jpg?sfvrsn=8)
In 2014, Rule 1420.1 was amended to add arsenic, benzene, and 1,3 butadiene emission limits with a compliance date of January 1, 2015. Since the benzene emission limits became effective, emissions have decreased.