Analysis of 2007 Emissions from Power Plants and Other ... - MARAMA

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March 2011Page 68Analysis of Emissions from Power Plants and Other Large Combustion SourcesWhile there were a handful of units outside of the MANE-VU State domain whereoperation occurred in 2007 but not in 2005, 2006 or 2008, there were no units identifiedwithin the MANE-VU State domain that meet this constraint. Additionally, no units wereidentified which were not in operation in 2007, yet operated in 2005, 2006 or 2008 withinthe MANE-VU domain.On a unit-by-unit basis, we reviewed the annual NOx and heat input data and compared2007 values to the average 2005-2008 values for the same variable. In the followingFigures, values reported >100% represent units where the 2007 value was greater than theaverage of 2005-2008 for that unit and variable. Many units are not required to report SO 2emissions, so similar analysis for SO 2 was not made.The box and whisker plots shown in the Figures below display the distribution of CEMreported data by State. In Figure 10-7, the distribution of 2007 CEM reported NOxemissions relative to the average annual CEM reported NOx emissions for 2005 through2008 is shown along with the number of CEM reporting units within each State (noted atthe top of the chart).Each data set is divided into four equal parts. The middle two quartiles represent half of allunits and are bounded by the white rectangle, each showing the comparison ratio of 2007values to averaged 2005-2008 values.The line above the top of each rectangle shows the range of the fourth or top quartile ofdata. The line below the bottom of the rectangle shows the range of the first or lowestquartile. The red triangle shows the median ratio of 2007 to averaged 2005-2008 NOxemissions or middle observation in the dataset. This median is not the average of the ratioswithin the group, but is the observation where half of the calculated ratios are greater andhalf the calculated ratios are lower. Finally, the green “x” and the purple square representthe maximum and minimum ratios for the data set, respectively.In cases where the majority of the white rectangle is above the 100% line, the majority ofunits reporting CEMs data within that State have a higher NOx emission value in 2007than the average of NOx emissions from 2005 through 2008. This can be seen inPennsylvania, Rhode Island and Vermont and is confirmed with comparisons to Table 10-1and Figure 10-4 above. States which show a minimum value of 0% in the two followingfigures reflect CEM reporting units which are shutdown or mothballed during the periodsof this analysis. In these cases, 2005, 2006, 2007 and 2008 values are all reported as zero.
Analysis of Emissions from Power Plants and Other Large Combustion Sources March 2011Page 693002502007 Unit-Level CEM Reported NOx Emission ValuesCompared to 2005-2008 State Averages61 units 5 units 39 units 87 units 50 units 13 units 15 units 168 units 353 units 208 units 11 units 1 unit25th PercentileMinMedianMax75th Percentile200Percentage (%)150100500CT DC DE MA MD ME NH NJ NY PA RI VTFigure 10-7. Box and whisker plot of 2007 NOx emissions relative to 2005-2008 averages.
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