This web page provides the most recent monthly hourly sulfur dioxide (SO₂) concentrations obtained at the Presque Isle monitoring site. This data has not been quality assured and is subject to change. This information is updated hourly.

Monthly Graphs: JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember 2010200920082007200620052004