# ATTACHMENT B 8-Hour Ozone Data

# 8-Hour OzoneData

The following presents the 8-hour ozone 4th highest values frommonitored ozone data as well as designvalue calculations for all sites inthe Southeast New HampshireNonattainmentArea. All data and calculations meet the criteria for data handling contained in EPA's "Guideline on Data Handling Conventionsforthe8-Hour Ozone NAAQS," December 1998. For thisanalysis, themost significant ofthesedata handling conventions are: 0
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# Avalid ozone monitoring day consists of "at least 18 out of 24 possible 8-hour averaging periods" unless "the daily maximum 8-hour averageconcentrationfortheday is greater than 0 .08 ppm ." "Avalid year must have valid 8-hour daily maximum ozone concentrations for at least 75% ofthe required monitoring days inthe ozone season" unless the 4th highvalue is greaterthan 0 .08ppm . For purposes of determining attainment status, "all three years must average at least 90% data completeness." In the event that the 3-year average ofthe 4t" highest values exceeds 0 .08ppm, thenyearswithless than 75% data recoveryare included inthecalculations. Design values are calculated by taking the average ofthree consecutive years' annual 4th highest values (which meet the data handlingconventions listed above) . Theyear cited for the design value is the final year of the 3-year average. Table B-1 contains data for the current Southeast New Hampshire Nonattainment Area since 1983. The data include the 4`h highest value for each year, data capture rates for both individual years and each 3-year period, and the valid design values for each site. TableB-1 also includes the 2012 thresholdvalue foreach sitethat has monitored ozone from2009- 2011 . The threshold value is defined as the 4th highest value needed in a given year to cause the designvalue forthat year to exceed the ozone NAAQS. To determine the threshold for exceeding, rather thanjust meeting, the 1997 8-hour ozone standard, the2012thresholdvaluewas calculatedas the 4~' highest value in 2012 that would make themean ofthe 2010-2012 annual 4th highest values equalto 86 ppb. Threshold values help to determine the likelihood that a given site/area will exceed the ozone NAAQSin the following ozone season. The data in Table B-1 showthat annual 4th highestvalues inthe Southeast New

Hampshire Nonattainment Area's have notcome close to the calculated 2012 thresholds in recent history. (Note: Annual 4th highest values and design values that exceed the 1997 8-hour ozone NAAQSarecoloredred inthetable.)y



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