Note: Continuous sulfate monitoring was discontinued in 2015.
- Indianapolis Washington Park Sulfate Data Reports [ZIP]
- 2014 4th Quarter Indianapolis Washington Park Sulfate Data Report
- 2014 3rd Quarter Indianapolis Washington Park Sulfate Data Report
- 2014 2nd Quarter Indianapolis Washington Park Sulfate Data Report
- 2014 1st Quarter Indianapolis Washington Park Sulfate Data Report
- 2013 4th Quarter Indianapolis Washington Park Sulfate Data Report
- 2013 3rd Quarter Indianapolis Washington Park Sulfate Data Report
- 2013 2nd Quarter Indianapolis Washington Park Sulfate Data Report
- 2013 1st Quarter Indianapolis Washington Park Sulfate Data Report
- 2012 4th Quarter Indianapolis Washington Park Sulfate Data Report
- 2012 3rd Quarter Indianapolis Washington Park Sulfate Data Report
- 2012 2nd Quarter Indianapolis Washington Park Sulfate Data Report
- 2012 1st Quarter Indianapolis Washington Park Sulfate Data Report