2

For each site within a county, pairs of points on the low and high year distributions were 

selected at percentiles ranging from 0% to 100% with 1% increments. Figures 1 through 

7 display these paired points by monitoring site, visualizing the relationship between the 

low and high year distributions for complete sites within each county. A line 

representing the linear fit of the data is also displayed along with the correlation 

coefficient characterizing the quality of the fit and the linear equation of the fit. The 

slope of the fit line is rounded to two decimal places, while the intercept is rounded to 

three. Plots not showing a value for the intercept mean that the value rounded to zero. 

Overall, the majority of sites across the seven counties exhibit a strong linear relationship 

between the low and high year distributions. In some cases, specific observations at 

individual sites deviate from linearity to varying degrees either at the extreme upper or 

lower ends of the distributions. Obviously noticeable deviations from the linear fit at 

most sites are limited to the extreme upper end of the distribution at values usually 

greater than the 95th percentile. 

In the majority of the monitor cases, the y-intercept of the best fit line is within plus or 

minus a few parts per billion. There are a few cases where the absolute value of the 

intercept is greater than a few parts per billion. A positive intercept indicates a 

percentage larger decline between high and low year concentrations in the upper end of 

the distribution than in the middle and lower percentiles. The positive intercept adds a 

constant value to the proportionally reduced individual concentrations across the 

distribution. The size of that offset will be larger relative to the concentrations at the 

lower end of the distribution and smaller relative to the concentrations at the upper end of 

the distribution. Hence, a linear relationship with a positive intercept will cause 

concentrations on the distribution’s upper end to be reduced by a larger percentage 

between the high and low years as opposed to concentrations in the middle and lower 

parts of the distribution. Similarly, a linear relationship with a negative intercept will 

cause a larger change to values in the middle and lower parts of the distribution than at 

the upper end. 

For the results shown from the seven counties, some of the points in the upper end of the 

distribution are above the best fit line. When this is the case, it means that the percentile 

point has not declined as much as the middle of the distribution. For many cases, the 

slope for the relationship between the low and high years is one or greater meaning that 

there was a broadly applicable increase in SO2 concentrations between the two years. 
3

Figure 1. Comparison of low to high year daily max hourly SO2 concentration distributions for sites 

within Hillsborough County FL 
4

Figure 2. Comparison of low to high year daily max hourly SO2 concentration distributions for sites 

within Green County MO 
5

Figure 3. Comparison of low to high year daily max hourly SO2 concentration distributions for a site 

within Iron County MO 
6

Figure 4. Comparison of low to high year daily max hourly SO2 concentration distributions for a site 

within Cuyahoga County OH 
7

Figure 5. Comparison of low to high year daily max hourly SO2 concentration distributions for sites 

within Allegheny County PA 
8

Figure 6. Comparison of low to high year daily max hourly SO2 concentration distributions for sites 

within Beaver County PA 
9

Figure 7. Comparison of low to high year daily max hourly SO2 concentration distributions for sites 

within Jefferson County TX 

An additional analysis was done to determine whether or not the relationship between 

high and low year SO2 concentrations remained consistent when examining the 

distributions from a subset of high and low years for the sites analyzed above. The three 

most complete low concentration years and the three most complete high concentration 

years which were unique to each site were paired to give nine combinations of low to 

high year comparisons with each comparison fitted to a linear model. An example of the 

nine possible pairings is presented in Figure 8 for a site used in Hillsborough County FL. 

For this particular site, the general slope of the relationship between the low and high 

concentration years is not sensitive to the choice of the high and low years. The 

studentized residuals were computed and compared to a students t distribution at a 

significance level of 10%. Points significant at the 10% level for each site and pair of 

years are listed in Tables 1 through 7. Highlighted entries within the tables correspond to 

site-year pairs appearing in Figures 1 through 7. 

The corresponding slope, intercept, and R2

 for each comparison as well as the individual 

point’s percent of the total error in the model are also listed. In general, an R2

 greater 

than 0.95 showed the data fit a linear model well across the entire span of the distribution. 

Values at the extreme upper end of the distribution tended to deviate more from linearity 

when the R2

 was between 0.9 and 0.94, while the middle part of the distribution remained 
10

linear. When the R2 fell below 0.9, the relationship between the low and high year 

distributions appeared to depend more on the role outliers played at specific sites in 

determining the R2

 with the remainder of the data being fit well by the linear model. The 

overall quality of the fit between the low and high years also appeared to be more 

dependent on the site rather than the area. 
11

Figure 8. Example of the Low to High Year Comparisons for a Monitor within Hillsborough County 

FL 
Table 1: Listing of Regression Statistics and Significant Outliers for Low to High Year SO2 Comparisons at Sites within

Hillsborough County, FL

Site High Year Low Year R2Intercept Slope Percentile Percent

of SSE

120570081 1977 2005 0.96 0.002 0.26 97 26

120570081 1977 2005 0.96 0.002 0.26 100 22

120570081 1992 2005 0.98 0.002 0.24 97 21

120570081 1992 2005 0.98 0.002 0.24 100 23

120570081 1993 2005 0.87 0.001 0.29 97 13

120570081 1993 2005 0.87 0.001 0.29 100 62

120570081 1977 2006 0.82 0.000 0.31 98 11

120570081 1977 2006 0.82 0.000 0.31 100 56

120570081 1992 2006 0.85 −0.001 0.29 99 10

120570081 1992 2006 0.85 −0.001 0.29 100 55

120570081 1993 2006 0.64 0.000 0.32 100 76

120570081 1977 2007 0.98 0.002 0.24 97 22

120570081 1977 2007 0.98 0.002 0.24 98 10

120570081 1977 2007 0.98 0.002 0.24 100 17

120570081 1992 2007 0.99 0.002 0.22 97 11

120570081 1992 2007 0.99 0.002 0.22 99 23

120570081 1992 2007 0.99 0.002 0.22 100 16

120570081 1993 2007 0.90 0.001 0.27 97 12

120570081 1993 2007 0.90 0.001 0.27 100 65

120570095 1982 2005 0.78 −0.003 0.28 99 13

120570095 1982 2005 0.78 −0.003 0.28 100 34

120570095 1983 2005 0.83 −0.004 0.30 99 16

120570095 1983 2005 0.83 −0.004 0.30 100 29

120570095 1984 2005 0.89 −0.002 0.26 99 12

120570095 1984 2005 0.89 −0.002 0.26 100 27

120570095 1982 2006 0.93 0.000 0.13 100 30

120570095 1983 2006 0.96 −0.001 0.14 99 12

120570095 1983 2006 0.96 −0.001 0.14 100 23

120570095 1984 2006 0.98 0.000 0.12 100 18

120570095 1982 2007 0.96 0.000 0.13 100 48

120570095 1983 2007 0.98 −0.001 0.14 100 45

120570095 1984 2007 0.99 0.000 0.12 99 26

120570095 1984 2007 0.99 0.000 0.12 100 31

120570109 1997 2005 0.85 −0.005 0.65 99 23

120570109 1997 2005 0.85 −0.005 0.65 100 26

120570109 1998 2005 0.86 −0.004 0.59 99 28

120570109 1998 2005 0.86 −0.004 0.59 100 23

120570109 1999 2005 0.92 −0.003 0.61 97 10

120570109 1999 2005 0.92 −0.003 0.61 99 46

120570109 1997 2006 0.92 −0.003 0.58 100 38

120570109 1998 2006 0.92 −0.002 0.53 99 10

120570109 1998 2006 0.92 −0.002 0.53 100 34

120570109 1999 2006 0.96 −0.001 0.54 96 14

120570109 1999 2006 0.96 −0.001 0.54 97 25

120570109 1999 2006 0.96 −0.001 0.54 99 16

120570109 1999 2006 0.96 −0.001 0.54 100 17

120570109 1997 2007 0.92 −0.006 0.73 100 13

120570109 1998 2007 0.92 −0.004 0.67 98 10

120570109 1998 2007 0.92 −0.004 0.67 99 12

120570109 1998 2007 0.92 −0.004 0.67 100 10

1
Table 1: Listing of Regression Statistics and Significant Outliers for Low to High Year SO2 Comparisons at Sites within

Hillsborough County, FL

Site High Year Low Year R2Intercept Slope Percentile Percent

of SSE

120570109 1999 2007 0.91 −0.003 0.66 96 10

120570109 1999 2007 0.91 −0.003 0.66 97 20

120570109 1999 2007 0.91 −0.003 0.66 98 10

120570109 1999 2007 0.91 −0.003 0.66 99 11

120570109 1999 2007 0.91 −0.003 0.66 100 21

120571035 1975 2005 0.92 −0.001 0.20 99 14

120571035 1975 2005 0.92 −0.001 0.20 100 41

120571035 1976 2005 0.97 −0.001 0.32 98 12

120571035 1976 2005 0.97 −0.001 0.32 100 20

120571035 1977 2005 0.99 0.002 0.34 98 23

120571035 1977 2005 0.99 0.002 0.34 99 13

120571035 1977 2005 0.99 0.002 0.34 100 9

120571035 1975 2006 0.77 −0.002 0.23 100 83

120571035 1976 2006 0.85 −0.003 0.39 100 74

120571035 1977 2006 0.91 0.000 0.43 99 28

120571035 1977 2006 0.91 0.000 0.43 100 53

120571035 1975 2007 0.79 −0.002 0.19 100 77

120571035 1976 2007 0.87 −0.002 0.32 100 70

120571035 1977 2007 0.95 0.000 0.35 99 22

120571035 1977 2007 0.95 0.000 0.35 100 59

2
Table 2: Listing of Regression Statistics and Significant Outliers for Low to High Year SO2 Comparisons at Sites within

Greene County, MO

Site High Year Low Year R2Intercept Slope Percentile Percent

of SSE

290770026 1979 2005 0.89 0.005 0.17 100 13

290770026 1980 2005 0.95 0.004 0.28 98 10

290770026 1980 2005 0.95 0.004 0.28 99 14

290770026 1981 2005 0.97 0.002 0.21 100 45

290770026 1979 2006 0.86 0.006 0.20 100 14

290770026 1980 2006 0.93 0.004 0.34 98 10

290770026 1980 2006 0.93 0.004 0.34 99 14

290770026 1981 2006 0.95 0.003 0.25 100 42

290770026 1980 2007 0.96 0.004 0.36 98 13

290770026 1980 2007 0.96 0.004 0.36 99 15

290770026 1981 2007 0.98 0.002 0.26 100 32

290770032 1984 2005 0.97 0.002 0.12 100 34

290770032 1985 2005 0.98 0.001 0.21 98 14

290770032 1985 2005 0.98 0.001 0.21 100 17

290770032 1986 2005 0.98 0.001 0.17 100 34

290770032 1984 2006 0.98 0.002 0.16 99 11

290770032 1984 2006 0.98 0.002 0.16 100 7

290770032 1985 2006 0.98 0.002 0.27 95 10

290770032 1985 2006 0.98 0.002 0.27 98 23

290770032 1984 2007 0.97 0.002 0.17 99 14

290770032 1984 2007 0.97 0.002 0.17 100 14

290770032 1985 2007 0.98 0.002 0.28 94 12

290770032 1985 2007 0.98 0.002 0.28 98 14

290770032 1985 2007 0.98 0.002 0.28 99 14

290770032 1986 2007 0.98 0.002 0.23 94 11

290770032 1986 2007 0.98 0.002 0.23 100 12

290770037 1996 2005 0.99 0.001 0.21 100 34

290770037 1997 2005 0.98 0.002 0.42 95 11

290770037 1997 2005 0.98 0.002 0.42 96 13

290770037 1997 2005 0.98 0.002 0.42 98 11

290770037 1997 2005 0.98 0.002 0.42 100 15

290770037 1998 2005 0.99 −0.001 0.86 98 30

290770037 1998 2005 0.99 −0.001 0.86 100 48

290770037 1996 2006 0.98 0.001 0.27 98 13

290770037 1996 2006 0.98 0.001 0.27 99 10

290770037 1996 2006 0.98 0.001 0.27 100 53

290770037 1997 2006 0.96 0.003 0.54 100 32

290770037 1998 2006 0.98 −0.001 1.10 100 43

290770037 1996 2007 0.96 0.000 0.22 99 51

290770037 1996 2007 0.96 0.000 0.22 100 9

290770037 1997 2007 0.97 0.001 0.45 99 69

290770037 1997 2007 0.97 0.001 0.45 100 22

290770037 1998 2007 0.97 −0.002 0.91 99 43

290770037 1998 2007 0.97 −0.002 0.91 100 9

290770040 2002 2005 0.86 0.003 0.82 97 16

290770040 2002 2005 0.86 0.003 0.82 98 15

290770040 2002 2005 0.86 0.003 0.82 99 22

290770040 2002 2005 0.86 0.003 0.82 100 19

290770040 2004 2005 0.99 −0.003 1.58 98 19

290770040 2004 2005 0.99 −0.003 1.58 99 22

1
Table 2: Listing of Regression Statistics and Significant Outliers for Low to High Year SO2 Comparisons at Sites within

Greene County, MO

Site High Year Low Year R2Intercept Slope Percentile Percent

of SSE

290770040 2004 2005 0.99 −0.003 1.58 100 5

290770040 2002 2006 0.88 0.003 0.65 99 32

290770040 2002 2006 0.88 0.003 0.65 100 18

290770040 2003 2006 0.99 −0.001 1.25 97 14

290770040 2003 2006 0.99 −0.001 1.25 98 18

290770040 2003 2006 0.99 −0.001 1.25 99 16

290770040 2003 2006 0.99 −0.001 1.25 100 15

290770040 2004 2006 0.99 −0.002 1.25 99 44

290770040 2002 2007 0.94 0.002 0.61 97 12

290770040 2002 2007 0.94 0.002 0.61 99 51

290770040 2002 2007 0.94 0.002 0.61 100 17

290770040 2003 2007 0.95 −0.002 1.12 100 31

290770040 2004 2007 0.96 −0.002 1.12 95 16

290770040 2004 2007 0.96 −0.002 1.12 96 11

290770040 2004 2007 0.96 −0.002 1.12 99 15

290770040 2004 2007 0.96 −0.002 1.12 100 15

290770041 2002 2005 0.90 0.000 1.22 100 54

290770041 2003 2005 0.99 −0.001 1.41 97 16

290770041 2003 2005 0.99 −0.001 1.41 99 37

290770041 2004 2005 0.97 0.000 1.11 99 55

290770041 2004 2005 0.97 0.000 1.11 100 19

290770041 2002 2006 0.75 −0.001 1.07 100 64

290770041 2003 2006 0.96 −0.001 1.33 100 28

290770041 2004 2006 0.98 −0.001 1.07 99 12

290770041 2004 2006 0.98 −0.001 1.07 100 9

290770041 2002 2007 0.96 0.000 0.62 100 32

290770041 2003 2007 0.95 0.000 0.69 98 22

290770041 2003 2007 0.95 0.000 0.69 99 10

290770041 2003 2007 0.95 0.000 0.69 100 29

290770041 2004 2007 0.91 0.001 0.53 98 15

290770041 2004 2007 0.91 0.001 0.53 99 18

290770041 2004 2007 0.91 0.001 0.53 100 28

2
Table 3: Listing of Regression Statistics and Significant Outliers for Low to High Year SO2 Comparisons at Sites within

Iron County, MO

Site High Year Low Year R2Intercept Slope Percentile Percent

of SSE

290930030 1997 2001 0.98 −0.002 1.07 99 19

290930030 1997 2001 0.98 −0.002 1.07 100 18

290930030 1998 2001 1.00 −0.002 1.18 99 40

290930030 1999 2001 0.85 0.010 0.79 99 11

290930030 1999 2001 0.85 0.010 0.79 100 39

290930030 1997 2002 0.99 −0.001 0.89 89 11

290930030 1997 2002 0.99 −0.001 0.89 90 11

290930030 1997 2002 0.99 −0.001 0.89 99 44

290930030 1998 2002 0.99 −0.001 0.97 99 27

290930030 1998 2002 0.99 −0.001 0.97 100 48

290930030 1999 2002 0.89 0.009 0.67 98 11

290930030 1999 2002 0.89 0.009 0.67 99 12

290930030 1999 2002 0.89 0.009 0.67 100 37

290930030 1997 2003 0.98 −0.001 0.83 99 42

290930030 1997 2003 0.98 −0.001 0.83 100 24

290930030 1998 2003 0.97 −0.001 0.91 100 66

290930030 1999 2003 0.94 0.006 0.65 99 17

290930030 1999 2003 0.94 0.006 0.65 100 37

290930031 1995 2001 0.95 0.006 0.69 97 11

290930031 1995 2001 0.95 0.006 0.69 98 11

290930031 1995 2001 0.95 0.006 0.69 100 41

290930031 1996 2001 0.99 0.003 0.76 84 11

290930031 1996 2001 0.99 0.003 0.76 85 11

290930031 1996 2001 0.99 0.003 0.76 100 18

290930031 1997 2001 0.99 −0.002 1.08 94 11

290930031 1997 2001 0.99 −0.002 1.08 95 10

290930031 1997 2001 0.99 −0.002 1.08 99 9

290930031 1995 2002 0.95 0.006 0.56 97 13

290930031 1995 2002 0.95 0.006 0.56 98 15

290930031 1995 2002 0.95 0.006 0.56 100 42

290930031 1996 2002 0.99 0.003 0.62 98 11

290930031 1996 2002 0.99 0.003 0.62 99 11

290930031 1996 2002 0.99 0.003 0.62 100 25

290930031 1997 2002 0.99 −0.001 0.88 95 21

290930031 1997 2002 0.99 −0.001 0.88 98 11

290930031 1995 2003 0.92 0.006 0.68 97 13

290930031 1995 2003 0.92 0.006 0.68 99 11

290930031 1995 2003 0.92 0.006 0.68 100 43

290930031 1996 2003 0.98 0.003 0.76 99 23

290930031 1996 2003 0.98 0.003 0.76 100 50

290930031 1997 2003 0.99 −0.003 1.09 100 27

1
Table 4: Listing of Regression Statistics and Significant Outliers for Low to High Year SO2 Comparisons at Sites within

Cuyahoga County, OH

Site High Year Low Year R2Intercept Slope Percentile Percent

of SSE

390350045 1985 2005 0.87 −0.008 0.42 100 74

390350045 1986 2005 0.97 −0.006 0.54 99 16

390350045 1986 2005 0.97 −0.006 0.54 100 11

390350045 1987 2005 0.93 −0.006 0.60 100 41

390350045 1985 2006 0.94 −0.008 0.41 100 60

390350045 1986 2006 0.96 −0.005 0.50 97 12

390350045 1986 2006 0.96 −0.005 0.50 98 16

390350045 1986 2006 0.96 −0.005 0.50 99 12

390350045 1987 2006 0.95 −0.005 0.56 98 11

390350045 1987 2006 0.95 −0.005 0.56 100 9

390350045 1985 2007 0.92 −0.010 0.42 100 57

390350045 1986 2007 0.95 −0.006 0.52 98 11

390350045 1986 2007 0.95 −0.006 0.52 99 10

390350045 1987 2007 0.95 −0.007 0.58 100 12

390350060 1993 2005 0.96 0.004 0.47 98 13

390350060 1993 2005 0.96 0.004 0.47 100 46

390350060 1994 2005 0.98 −0.001 0.65 95 12

390350060 1994 2005 0.98 −0.001 0.65 99 20

390350060 1994 2005 0.98 −0.001 0.65 100 24

390350060 1995 2005 0.96 −0.003 0.98 99 20

390350060 1995 2005 0.96 −0.003 0.98 100 41

390350060 1993 2006 0.91 0.004 0.46 100 40

390350060 1994 2006 0.99 −0.002 0.66 99 10

390350060 1995 2006 0.99 −0.004 1.00 100 22

390350060 1993 2007 0.97 0.003 0.57 99 12

390350060 1993 2007 0.97 0.003 0.57 100 27

390350060 1994 2007 0.98 −0.003 0.78 100 57

390350060 1995 2007 0.96 −0.004 1.18 100 77

390350065 1998 2005 0.88 −0.004 1.07 100 67

390350065 1999 2005 0.97 0.003 0.56 99 14

390350065 1999 2005 0.97 0.003 0.56 100 3

390350065 2000 2005 0.91 −0.004 1.33 99 32

390350065 2000 2005 0.91 −0.004 1.33 100 54

390350065 1998 2006 0.98 −0.003 1.34 100 51

390350065 1999 2006 0.89 0.007 0.63 100 22

390350065 2000 2006 0.99 −0.003 1.64 99 28

390350065 2000 2006 0.99 −0.003 1.64 100 13

390350065 1998 2007 0.99 −0.003 1.00 98 15

390350065 1999 2007 0.83 0.005 0.46 100 25

390350065 2000 2007 0.98 −0.003 1.23 96 15

390350065 2000 2007 0.98 −0.003 1.23 97 11

390350065 2000 2007 0.98 −0.003 1.23 98 17

390350065 2000 2007 0.98 −0.003 1.23 100 7

1
Table 5: Listing of Regression Statistics and Significant Outliers for Low to High Year SO2 Comparisons at Sites within

Allegheny County, PA

Site High Year Low Year R2Intercept Slope Percentile Percent

of SSE

420030002 1981 2005 0.97 −0.001 0.37 100 73

420030002 1982 2005 0.99 0.001 0.35 98 12

420030002 1982 2005 0.99 0.001 0.35 100 9

420030002 1983 2005 1.00 −0.001 0.39 99 18

420030002 1983 2005 1.00 −0.001 0.39 100 10

420030002 1981 2006 0.88 −0.002 0.32 100 78

420030002 1982 2006 0.96 −0.001 0.32 98 13

420030002 1982 2006 0.96 −0.001 0.32 100 60

420030002 1983 2006 0.96 −0.003 0.36 100 62

420030002 1981 2007 0.98 −0.001 0.31 100 58

420030002 1982 2007 0.99 0.001 0.30 99 39

420030002 1983 2007 0.99 −0.001 0.33 99 60

420030002 1983 2007 0.99 −0.001 0.33 100 7

420030010 1998 2005 0.98 0.003 1.26 99 63

420030010 1998 2005 0.98 0.003 1.26 100 12

420030010 1999 2005 0.98 0.003 1.09 99 12

420030010 1999 2005 0.98 0.003 1.09 97 18

420030010 2000 2005 0.98 0.000 0.85 99 67

420030010 1998 2006 0.96 0.001 1.13 99 13

420030010 1998 2006 0.96 0.001 1.13 100 68

420030010 1999 2006 0.95 0.001 0.97 99 18

420030010 1999 2006 0.95 0.001 0.97 100 35

420030010 2000 2006 0.98 −0.002 0.77 99 13

420030010 2000 2006 0.98 −0.002 0.77 100 65

420030010 1998 2007 0.99 0.001 1.13 100 46

420030010 1999 2007 0.93 0.001 0.95 99 47

420030010 2000 2007 0.99 −0.002 0.77 100 20

420030021 1975 2005 0.96 −0.001 0.25 100 56

420030021 1976 2005 0.93 −0.005 0.16 100 57

420030021 1977 2005 0.89 −0.010 0.17 100 45

420030021 1975 2006 1.00 0.001 0.20 99 17

420030021 1976 2006 0.98 −0.003 0.13 99 15

420030021 1976 2006 0.98 −0.003 0.13 100 12

420030021 1975 2007 0.99 0.002 0.19 96 16

420030021 1975 2007 0.99 0.002 0.19 97 21

420030021 1975 2007 0.99 0.002 0.19 100 16

420030021 1976 2007 0.97 −0.001 0.12 99 14

420030021 1976 2007 0.97 −0.001 0.12 100 38

420030021 1977 2007 0.94 −0.005 0.13 100 24

420030064 1976 2005 0.99 0.003 0.20 100 25

420030064 1977 2005 0.96 0.001 0.19 100 20

420030064 1978 2005 0.96 0.003 0.30 100 44

420030064 1976 2006 0.97 −0.001 0.23 100 58

420030064 1977 2006 0.93 −0.004 0.23 100 42

420030064 1978 2006 0.98 −0.002 0.36 95 13

420030064 1978 2006 0.98 −0.002 0.36 96 14

420030064 1978 2006 0.98 −0.002 0.36 97 11

420030064 1978 2006 0.98 −0.002 0.36 100 26

420030064 1976 2007 0.85 −0.007 0.28 99 12

420030064 1976 2007 0.85 −0.007 0.28 100 44

1
Table 5: Listing of Regression Statistics and Significant Outliers for Low to High Year SO2 Comparisons at Sites within

Allegheny County, PA

Site High Year Low Year R2Intercept Slope Percentile Percent

of SSE

420030064 1977 2007 0.78 −0.010 0.27 99 12

420030064 1977 2007 0.78 −0.010 0.27 100 41

420030064 1978 2007 0.94 −0.010 0.46 99 19

420030067 1981 2005 0.98 0.002 0.54 100 55

420030067 1982 2005 0.99 0.003 0.55 97 28

420030067 1982 2005 0.99 0.003 0.55 98 27

420030067 1982 2005 0.99 0.003 0.55 100 15

420030067 1983 2005 0.96 0.004 0.54 100 38

420030067 1981 2006 0.99 −0.001 0.50 97 14

420030067 1981 2006 0.99 −0.001 0.50 98 21

420030067 1981 2006 0.99 −0.001 0.50 100 15

420030067 1982 2006 0.98 0.001 0.50 98 18

420030067 1982 2006 0.98 0.001 0.50 100 18

420030067 1983 2006 0.99 0.001 0.50 99 16

420030067 1983 2006 0.99 0.001 0.50 96 18

420030067 1983 2006 0.99 0.001 0.50 100 19

420030067 1981 2007 0.99 0.000 0.49 99 26

420030067 1981 2007 0.99 0.000 0.49 100 13

420030067 1982 2007 0.99 0.001 0.49 91 11

420030067 1982 2007 0.99 0.001 0.49 100 22

420030067 1983 2007 0.98 0.001 0.49 100 14

420030067 1983 2007 0.98 0.001 0.49 98 10

2
Table 6: Listing of Regression Statistics and Significant Outliers for Low to High Year SO2 Comparisons at Sites within

Beaver County, PA

Site High Year Low Year R2Intercept Slope Percentile Percent

of SSE

420070002 1983 2005 0.98 0.006 0.51 100 30

420070002 1984 2005 0.96 0.000 0.71 100 70

420070002 1985 2005 0.95 −0.006 0.74 100 63

420070002 1983 2006 0.95 0.006 0.39 100 38

420070002 1984 2006 0.98 0.001 0.55 100 45

420070002 1984 2006 0.98 0.001 0.55 99 10

420070002 1985 2006 0.98 −0.004 0.58 100 63

420070002 1983 2007 0.99 0.002 0.52 98 18

420070002 1983 2007 0.99 0.002 0.52 99 45

420070002 1983 2007 0.99 0.002 0.52 100 9

420070002 1984 2007 0.93 −0.003 0.71 100 71

420070002 1985 2007 0.90 −0.008 0.73 99 11

420070002 1985 2007 0.90 −0.008 0.73 100 59

420070014 1978 2005 0.88 0.003 0.45 100 43

420070014 1978 2006 0.87 0.003 0.37 100 42

420070014 1980 2006 1.00 −0.001 0.48 88 11

420070014 1980 2006 1.00 −0.001 0.48 89 11

420070014 1980 2006 1.00 −0.001 0.48 100 14

420070014 1981 2006 1.00 0.000 0.45 99 13

420070014 1978 2007 0.87 0.005 0.38 100 47

420070014 1980 2007 0.99 0.001 0.49 100 19

420070014 1981 2007 0.99 0.002 0.46 100 13

1
Table 7: Listing of Regression Statistics and Significant Outliers for Low to High Year SO2 Comparisons at Sites within

Jefferson County, TX

Site High Year Low Year R2Intercept Slope Percentile Percent

of SSE

482450009 1982 2005 0.97 0.000 0.45 99 32

482450009 1983 2005 0.99 0.000 0.52 99 23

482450009 1981 2006 0.77 −0.023 0.77 97 13

482450009 1981 2006 0.77 −0.023 0.77 98 13

482450009 1981 2006 0.77 −0.023 0.77 99 18

482450009 1982 2006 0.93 −0.011 0.85 97 13

482450009 1983 2006 0.89 −0.010 0.97 97 18

482450009 1983 2006 0.89 −0.010 0.97 98 11

482450009 1981 2007 0.75 −0.010 0.34 99 18

482450009 1981 2007 0.75 −0.010 0.34 100 21

482450009 1982 2007 0.86 −0.005 0.36 100 45

482450009 1983 2007 0.86 −0.004 0.42 100 27

482450011 1982 2005 1.00 0.001 0.18 94 11

482450011 1982 2005 1.00 0.001 0.18 100 20

482450011 1983 2005 0.93 0.003 0.21 97 13

482450011 1983 2005 0.93 0.003 0.21 98 13

482450011 1983 2005 0.93 0.003 0.21 100 25

482450011 1984 2005 0.94 0.002 0.13 96 11

482450011 1984 2005 0.94 0.002 0.13 97 14

482450011 1984 2005 0.94 0.002 0.13 99 36

482450011 1982 2006 0.97 −0.002 0.29 100 26

482450011 1982 2006 0.97 −0.002 0.29 99 18

482450011 1983 2006 0.84 0.001 0.32 100 28

482450011 1984 2006 0.89 −0.001 0.21 97 13

482450011 1984 2006 0.89 −0.001 0.21 100 13

482450011 1982 2007 0.98 0.002 0.20 100 53

482450011 1983 2007 0.84 0.004 0.22 97 10

482450011 1983 2007 0.84 0.004 0.22 98 12

482450011 1983 2007 0.84 0.004 0.22 100 29

482450011 1984 2007 0.88 0.002 0.14 97 14

482450011 1984 2007 0.88 0.002 0.14 96 13

482450011 1984 2007 0.88 0.002 0.14 99 10

482450011 1984 2007 0.88 0.002 0.14 95 12

482450011 1984 2007 0.88 0.002 0.14 100 13

482450020 1998 2005 0.98 −0.003 0.48 100 31

482450020 1999 2005 0.98 0.000 0.43 100 26

482450020 1999 2005 0.98 0.000 0.43 98 20

482450020 2000 2005 0.98 −0.003 0.71 100 24

482450020 1998 2006 0.87 −0.010 1.01 100 63

482450020 1999 2006 0.97 −0.005 0.95 99 17

482450020 1999 2006 0.97 −0.005 0.95 100 45

482450020 2000 2006 0.88 −0.010 1.49 100 62

482450020 1998 2007 0.87 −0.005 0.63 100 64

482450020 1999 2007 0.96 −0.002 0.59 99 24

482450020 1999 2007 0.96 −0.002 0.59 100 40

482450020 2000 2007 0.88 −0.005 0.93 100 62

482450020 2000 2007 0.88 −0.005 0.93 99 10

1