M4 East EIS Volume 2B App H Part 5 Air Quality

M4 East EIS Volume 2B App H Part 5 Air Quality (pdf)

Contents	Pages
8.4 Dispersion modelling (continued from part 4)	123
8.5 Results for expected traffic scenarios	126
8.6 Results for regulatory worst case scenarios	172
8.7 Summary of key assumptions	173
8.8 Sensitivity tests	179
9 Assessment of cumulative impacts	182
9.1 Overview	182
9.2 In-tunnel air quality	182
9.3 Ambient air quality	182
10 Management of impacts	183
10.1 Construction impacts	183
10.2 Operational impacts	186
11 Summary and conclusions	196
11.1 Construction impacts	196
11.2 Operational impacts	196
11.3 Management of impacts	200
12 References	201
Appendix A: Traffic pollutants and their effects	A
Appendix B: Pollutant formation, dispersion and transformation	B
Appendix C: Review of legislation and criteria relating to emissions and air quality	C
Appendix D: Examples of previous air quality assessments	D
Appendix E: Description and evaluation of emission models	E
Appendix F: Existing air quality and assumed background concentrations (continues in part 6)	F