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Terms S02-sulfur dioxide is a gas that is a respiratory irritant at - PowerPoint PPT Presentation

Terms S02-sulfur dioxide is a gas that is a respiratory irritant at high concentrations. S02 Standard-The existing standard, established in 2010, is 75 parts per billion based on the 3-year average of the 99th percentile of the yearly


  1. Terms • S02-sulfur dioxide is a gas that is a respiratory irritant at high concentrations. • S02 Standard-The existing standard, established in 2010, is 75 parts per billion based on the 3-year average of the 99th percentile of the yearly distribution of 1- hour daily maximum concentrations. • S02 exceedance-a one hour average of > 75 PPB per 24-hour period • Desulfurization-the process by which sulfur is removed from the coke oven gas stream • Hot idling means that the batteries that make coke remain hot but are not producing. • Air Quality Episode-an unexpected event such as a major breakdown causing air quality issues • Poor dispersion: when air near the ground is cold with warmer air above acting as a “lid” on the valley holding emissions down and preventing their spreading out.

  2. PM 2.5 and SO2 trends EPA standard= 12.0 µg/m 3 EPA standard = 75 ppb

  3. Liberty Monitor

  4. Hours 1 am 80 2 am 3 am Hourly S02 Exceedances at the Liberty 4 am 76 5 am Monitor By Day 12/24/18-1/8/2019 6 am 7 am 8 am 9 am 10 am 80 145 11 am 80 Noon 1 pm 2 pm 3 pm 4 pm 5 pm 6 pm 7 pm 8 pm 9 pm 81 10 pm 11 pm 85 Midnight 24-Dec 25-Dec 26-Dec 27-Dec 28-Dec 29-Dec 30-Dec 31-Dec 1-Jan 2-Jan 3-Jan 4-Jan 5-Jan 6-Jan 7-Jan 8-Jan >.075 (parts per billion)-EXCEEDANCE of = <.075 (parts per billion) NO EXCEEDANCE = the EPA Standard

  5. Timeline Post US Steel Fire Highest Daily S02 level Dec. 24 2018-January 8 th 2019 at the Liberty Monitor Emergency Level = 800 PPB for 24 hours 400 PPB = EPA determined threshold for moderate changes for normal individuals EPA S02 hourly standard=75 PPB

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