ATTACHMENT B 

8-Hour Ozone Data 
8-Hour Ozone Data 

The following presents the 8-hour ozone 4th highest values from monitored ozone data as well as 

design value calculations for all sites in the Southeast New Hampshire Nonattainment Area. All data 

and calculations meet the criteria for data handling contained in EPA's "Guideline on Data 

Handling Conventions for the 8-Hour Ozone NAAQS," December 1998. For this analysis, the most 

significant of these data handling conventions are: 

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A valid ozone monitoring day consists of "at least 18 out of 24 possible 8-hour averaging 

periods" unless "the daily maximum 8-hour average concentration for the day is greater than 

0.08 ppm." 

"A valid year must have valid 8-hour daily maximum ozone concentrations for at least 75% 

of the required monitoring days in the ozone season" unless the 4th high value is greater than 

0.08 ppm. 

For purposes of determining attainment status, "all three years must average at least 90% 

data completeness ." In the event that the 3-year average of the 4t" highest values exceeds 

0.08 ppm, then years with less than 75% data recovery are included in the calculations . 

Design values are calculated by taking the average of three consecutive years' annual 4th highest 

values (which meet the data handling conventions listed above) . The year 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 . 

Table B-1 also includes the 2012 threshold value for each site that has monitored ozone from 2009-

2011 . The threshold value is defined as the 4th highest value needed in a given year to cause the 

design value for that year to exceed the ozone NAAQS. To determine the threshold for exceeding, 

rather than just meeting, the 1997 8-hour ozone standard, the 2012 threshold value was calculated as 

the 4~' highest value in 2012 that would make the mean of the 2010-2012 annual 4th highest values 

equal to 86 ppb. 

Threshold values help to determine the likelihood that a given site/area will exceed the ozone 

NAAQS in the following ozone season . The data in Table B-1 show that annual 4th highest values 

in the Southeast New Hampshire Nonattainment Area's have not come close to the calculated 2012 

thresholds in recent history. (Note: Annual 4th highest values and design values that exceed the 

1997 8-hour ozone NAAQS are colored red in the table .) 
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