### 2

**For each site within a county, pairs of points on t he low and high year distributions were**  **selected at percentiles ranging from 0% to 100% wit h 1% increments. Figures 1 through**  **7 display these paired points by monitoring site, v isualizing 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 dis played along with the correlation**  **coefficient characterizing the quality of the fit a nd the linear equation of the fit. The**  **slope of the fit line is rounded to two decimal pla ces, 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 cou nties exhibit a strong linear relationship**  **between the low and high year distributions. In so me cases, specific observations at**  **individual sites deviate from linearity to varying degrees either at the extreme upper or**  **lower ends of the distributions. Obviously noticea ble deviations from the linear fit at**  **most sites are limited to the extreme upper end of the distribution at values usually**  **greater than the 95 th** 

### percentile. **In the majority of the monitor cases, the y-interce pt of the best fit line is within plus or**  **minus a few parts per billion. There are a few cas es 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 perce ntiles. The positive intercept adds a**  **constant value to the proportionally reduced indivi dual concentrations across the**  **distribution. The size of that offset will be larg er 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 wit h a positive intercept will cause**  **concentrations on the distribution’s upper end to b e reduced by a larger percentage**  **between the high and low years as opposed to concen trations in the middle and lower**  **parts of the distribution. Similarly, a linear rel ationship with a negative intercept will**  **cause a larger change to values in the middle and l ower 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 thi** **s 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 SO** **2**

### concentrations between the two years.

### 3

Figure 1. Comparison of low to high year daily maxhourly SO2concentration distributions for sites within Hillsborough County FL

### 4

Figure 2. Comparison of low to high year daily maxhourly SO2 concentration distributions for sites within Green County MO

### 5

Figure 3. Comparison of low to high year daily maxhourly SO2 concentration distributions for a site within Iron County MO

### 6

Figure 4. Comparison of low to high year daily maxhourly SO2 concentration distributions for a site within Cuyahoga County OH

### 7

Figure 5. Comparison of low to high year daily maxhourly SO2 concentration distributions for sites within Allegheny County PA

### 8

Figure 6. Comparison of low to high year daily maxhourly SO2 concentration distributions for sites within Beaver County PA

### 9

Figure 7. Comparison of low to high year daily maxhourly SO2 concentration distributions for sites within Jefferson County TX 

### An additional analysis was done to determine whethe**r or not the relationship between high and low year SO** **2**

### concentrations remained consistent when examining **the distributions from a subset of high and low years f**  **or 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 t** **o 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 t** **he 10% level for each site and pair of years are listed in Tables 1 through 7. Highlighte** **d entries within the tables correspond to site-year pairs appearing in Figures 1 through 7.**  **The corresponding slope, intercept, and R 2** 

### for each comparison as well as the individual **point’s percent of the total error in the model are also listed. In general, an R** **2**

### greater **than 0.95 showed the data fit a linear model well a cross the entire span of the distribution.**  **Values at the extreme upper end of the distribution tended to deviate more from linearity**  **when the R 2** 

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

### 10

**linear. When the R 2** 

### fell below 0.9, the relationship between the low a**nd high year distributions appeared to depend more on the role o** **utliers played at specific sites in determining the R** **2**

### with the remainder of the data being fit well by t**he 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 FLTable 1: Listing of Regression Statistics and Significant Outliers for Low to High Year SO 2 Comparisons at Sites within Hillsborough County, FL Site High Year Low Year R2 Intercept 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
1Table 1: Listing of Regression Statistics and Significant Outliers for Low to High Year SO 2 Comparisons at Sites within Hillsborough County, FL Site High Year Low Year R2 Intercept 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

2Table 2: Listing of Regression Statistics and Significant Outliers for Low to High Year SO 2 Comparisons at Sites within Greene County, MO Site High Year Low Year R2 Intercept 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
1Table 2: Listing of Regression Statistics and Significant Outliers for Low to High Year SO 2 Comparisons at Sites within Greene County, MO Site High Year Low Year R2 Intercept 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

2Table 3: Listing of Regression Statistics and Significant Outliers for Low to High Year SO 2 Comparisons at Sites within Iron County, MO Site High Year Low Year R2 Intercept 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

1Table 4: Listing of Regression Statistics and Significant Outliers for Low to High Year SO 2 Comparisons at Sites within Cuyahoga County, OH Site High Year Low Year R2 Intercept 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

1Table 5: Listing of Regression Statistics and Significant Outliers for Low to High Year SO 2 Comparisons at Sites within Allegheny County, PA Site High Year Low Year R2 Intercept 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
1Table 5: Listing of Regression Statistics and Significant Outliers for Low to High Year SO 2 Comparisons at Sites within Allegheny County, PA Site High Year Low Year R2 Intercept 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

2Table 6: Listing of Regression Statistics and Significant Outliers for Low to High Year SO 2 Comparisons at Sites within Beaver County, PA Site High Year Low Year R2 Intercept 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

1Table 7: Listing of Regression Statistics and Significant Outliers for Low to High Year SO 2 Comparisons at Sites within Jefferson County, TX Site High Year Low Year R2 Intercept 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