Appendix 14.6 Scottish Transport Analysis Guidance Local Air Quality Appraisal

Total properties across all routes (min)

76

33

40

29

178

Total properties across all routes (some)

77

60

50

38

225

Do-minimum PM₁₀ assessment

Total assessment PM₁₀ (I):

across all routes

656.8

276.64

332.8

240.76

1507

Do-something PM₁₀ assessment

Total assessment PM₁₀ (II):

across all routes

656.76

500.21

415.26

315.29

1887.52

Net total assessment for PM₁₀, all routes (II-I)

380.52

Number of properties with an improvement

85

Number of properties with no change

3

Number of properties with a deterioration

2

Reference Sources:

DMRB Screening method version 1.03c (July 2007)

Quantitative Measures:

Air quality would improve (negative number) at properties adjacent to the current alignment of the A82, and the A85. However, the overall assessment score is positive due to positive assessment score for the proposed bypass alignment.

Assessment Scores:

380.52

Qualitative Comments:

The proposed bypass would give rise to an improvement in air quality at approximately 85 properties and a deterioration in air quality at 2 properties. Approximately three properties will not experience a change in local air quality.

The scheme is not located within an Air Quality Management Area.

Properties (amin)

26

7

16

6

55

Properties (asome)

26

7

16

6

55

PM₁₀ concentration at average point

At 20m:

At 70m:

At 115m:

At 175m:

N/A

within band for do-minimum (bmin)

8.75

8.42

8.33

8.31

PM₁₀ concentration at average point

At 20m:

At 70m:

At 115m:

At 175m:

N/A

within band for do-something (bsome)

8.55

8.37

8.31

8.3

Do-minimum PM₁₀ assessment

Total route assess PM₁₀ (I):

(c = amin*bmin)

227.5

58.94

133.28

49.86

469.58

Do-something PM₁₀ assessment

Total route assess PM₁₀ (II):

(c = asome*bsome)

222.3

58.59

132.96

49.8

463.65

Net total route assessment for PM₁₀ (II-I)

55

0

0

-5.93

Properties (amin)

36

8

8

12

64

Properties (asome)

36

8

8

12

64

PM₁₀ concentration at average point

At 20m:

At 70m:

At 115m:

At 175m:

N/A

within band for do-minimum (bmin)

8.6

8.38

8.32

8.3

PM₁₀ concentration at average point

At 20m:

At 70m:

At 115m:

At 175m:

N/A

within band for do-something (bsome)

8.59

8.38

8.32

8.3

Do-minimum PM₁₀ assessment

Total route assess PM₁₀ (I):

(c = amin*bmin)

309.6

67.04

66.56

99.6

542.8

Do-something PM₁₀ assessment

Total route assess PM₁₀ (II):

(c = asome*bsome)

309.24

67.04

66.56

99.6

542.44

Net total route assessment for PM₁₀ (II-I)

64

0

0

-0.36

Properties (amin)

14

18

16

11

59

Properties (asome)

14

18

16

11

59

PM₁₀ concentration at average point

At 20m:

At 70m:

At 115m:

At 175m:

N/A

within band for do-minimum (bmin)

8.55

8.37

8.31

8.3

PM₁₀ concentration at average point

At 20m:

At 70m:

At 115m:

At 175m:

N/A

within band for do-something (bsome)

8.34

8.3

8.29

8.29

Do-minimum PM₁₀ assessment

Total route assess PM₁₀ (I):

(c = amin*bmin)

119.7

150.66

132.96

91.3

494.62

Do-something PM₁₀ assessment

Total route assess PM₁₀ (II):

(c = asome*bsome)

116.76

149.4

132.64

91.19

489.99

Net total route assessment for PM₁₀ (II-I)

59

0

0

-4.63

Properties (amin)

0

0

0

0

0

Properties (asome)

1

27

10

9

47

PM₁₀ concentration at average point

At 20m:

At 70m:

At 115m:

At 175m:

N/A

within band for do-minimum (bmin)

0

0

0

0

PM₁₀ concentration at average point

At 20m:

At 70m:

At 115m:

At 175m:

N/A

within band for do-something (bsome)

8.46

8.34

8.31

8.3

Do-minimum PM₁₀ assessment

Total route assess PM₁₀ (I):

(c = amin*bmin)

0

0

0

0

0

Do-something PM₁₀ assessment

Total route assess PM₁₀ (II):

(c = asome*bsome)

8.46

225.18

83.1

74.7

391.44

Net total route assessment for PM₁₀ (II-I)

0

0

47

391.44

Total properties across all routes (min)

76

33

40

29

178

Total properties across all routes (some)

77

60

50

38

225

Do-minimum NO₂ assessment

Total assessment NO₂ (I):

across all routes

326.96

93.92

101.76

70.76

593.4

Do-something NO₂ assessment

Total assessment NO₂ (II):

across all routes

284.5

157.82

123.4

91.91

657.63

Net total assessment for NO₂, all routes (II-I)

64.23

Number of properties with an improvement

85

Number of properties with no change

3

Number of properties with a deterioration

2

Reference Sources:

DMRB Screening method version 1.03c (July 2007)

Quantitative Measures:

Air quality would improve (negative number) at properties adjacent to the current alignment of the A82, and the A85. However, the overall assessment score is positive due to positive assessment score for the proposed bypass alignment.

Assessment Scores:

64.23

Qualitative Comments:

The proposed bypass would give rise to an improvement in air quality at approximately 85 properties and a deterioration in air quality at 2 properties. Approximately three properties will not experience a change in local air quality.

The scheme is not located within an Air Quality Management Area.

Properties (amin)

26

7

16

6

55

Properties (asome)

26

7

16

6

55

NO₂ concentration at average point

At 20m:

At 70m:

At 115m:

At 175m:

N/A

within band for do-minimum (bmin)

4.91

3.12

2.61

2.46

NO₂ concentration at average point

At 20m:

At 70m:

At 115m:

At 175m:

N/A

within band for do-something (bsome)

3.76

2.77

2.5

2.45

Do-minimum NO₂ assessment

Total route assess NO₂ (I):

(c = amin*bmin)

127.66

21.84

41.76

14.76

206.02

Do-something NO₂ assessment

Total route assess NO₂ (II):

(c = asome*bsome)

97.76

19.39

40

14.7

171.85

Net total route assessment for NO₂ (II-I)

55

0

0

-34.17

Properties (amin)

36

8

8

12

64

Properties (asome)

36

8

8

12

64

NO₂ concentration at average point

At 20m:

At 70m:

At 115m:

At 175m:

N/A

within band for do-minimum (bmin)

4.14

2.89

2.54

2.43

NO₂ concentration at average point

At 20m:

At 70m:

At 115m:

At 175m:

N/A

within band for do-something (bsome)

4.08

2.87

2.53

2.43

Do-minimum NO₂ assessment

Total route assess NO₂ (I):

(c = amin*bmin)

149.04

23.12

20.32

29.16

221.64

Do-something NO₂ assessment

Total route assess NO₂ (II):

(c = asome*bsome)

146.88

22.96

20.24

29.16

219.24

Net total route assessment for NO₂ (II-I)

64

0

0

-2.4

Properties (amin)

14

18

16

11

59

Properties (asome)

14

18

16

11

59

NO₂ concentration at average point

At 20m:

At 70m:

At 115m:

At 175m:

N/A

within band for do-minimum (bmin)

3.59

2.72

2.48

2.44

NO₂ concentration at average point

At 20m:

At 70m:

At 115m:

At 175m:

N/A

within band for do-something (bsome)

2.61

2.44

2.41

2.38

Do-minimum NO₂ assessment

Total route assess NO₂ (I):

(c = amin*bmin)

50.26

48.96

39.68

26.84

165.74

Do-something NO₂ assessment

Total route assess NO₂ (II):

(c = asome*bsome)

36.54

43.92

38.56

26.18

145.2

Net total route assessment for NO₂ (II-I)

59

0

0

-20.54

Properties (amin)

0

0

0

0

0

Properties (asome)

1

27

10

9

47

NO₂ concentration at average point

At 20m:

At 70m:

At 115m:

At 175m:

N/A

within band for do-minimum (bmin)

0

0

0

0

NO₂ concentration at average point

At 20m:

At 70m:

At 115m:

At 175m:

N/A

within band for do-something (bsome)

3.32

2.65

2.46

2.43

Do-minimum NO₂ assessment

Total route assess NO₂ (I):

(c = amin*bmin)

0

0

0

0

0

Do-something NO₂ assessment

Total route assess NO₂ (II):

(c = asome*bsome)

3.32

71.55

24.6

21.87

121.34

Net total route assessment for NO₂ (II-I)

0

0

47

121.34