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Going the extra mile for air quality focus areas - Rosemary Challen, RPS

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What is an air quality focus area? The challenges, solutions including a case study on 'The Old Vinyl Factory'

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Going the extra mile for air quality focus areas - Rosemary Challen, RPS

  1. 1. rpsgroup.com Going the Extra Mile for Air Quality Focus Areas Rosemary Challen, RPS http://newlondondevelopment.com/nld/project/the_old_vinyl_factory
  2. 2. Overview  What is an Air Quality Focus Area?  Case Study: The Old Vinyl Factory  Challenges  Solutions  Conclusions 2
  3. 3. 3 What is an Air Quality Focus Area?  Locations where exceedance of air quality objectives coincide with a high population density, or schools/hospitals  187 AQFAs in London
  4. 4. 4 Case Study: The Old Vinyl Factory  Mixed-use development in Hayes, Middlesex (London Borough of Hillingdon)  Within Hillingdon AQMA (designated for NO2)  ~300 m south-west of Hayes Town AQFA
  5. 5. 5 The Old Vinyl Factory – Air Quality Assessment  In 2013, planning permission was granted subject to conditions… ➢ An assessment of the AQ impacts of the District Heating Network ➢ Details of the means to control and limit air pollution from the DHN
  6. 6. 6 The Old Vinyl Factory DHN – Assessment Outcome  Impacts ranging from ‘negligible’ to ‘slight’. Annual-mean NO2 objective exceeded at 4 out of 26 receptors.  Overall, air quality effects considered ‘not significant’ and mitigation was not considered necessary.
  7. 7. 7 Issues and Discussions with LBH Long term average concentration at receptor in assessment year % Change in concentration relative to Air Quality Assessment Level 1 2-5 6-10 >10 75 % or less of AQAL Negligible Negligible Slight Moderate 76 -94 % of AQAL Negligible Slight Moderate Moderate 95 - 102 % of AQAL Slight Moderate Moderate Substantial 103 – 109 % of AQAL Moderate Moderate Substantial Substantial 110 % or more than AQAL Moderate Substantial Substantial Substantial
  8. 8. 8 Issues and Discussions with LBH “The proposed development falls within Hillingdon’s Hayes Focus Area and therefore slight adverse impacts need to be removed”
  9. 9. 9 Mitigation Hierarchy 1. Prevent/avoid exposure by eliminating source
  10. 10. 10 Mitigation Hierarchy 2. Reduce and minimise exposure a. Mitigation measures on source b. Mitigation measures on pathway c. Mitigation measures at receptor
  11. 11. 11 Mitigation Hierarchy 3. Off-setting Mitigation measures and financial contribution far exceeded the damage costs
  12. 12. 12 Conclusions The Local Authority’s view on significant effects was influenced by the AQFA – they wanted the developer to go further than usual good practice to reduce impacts. Assessing a centralised heat and power scheme is not straight forward… Individual unregulated sources Vs. Regulated DHN source Most appropriate mitigation measures reduced exposure to other pollution sources in the wider area not just to the small contribution from the DHN. The LA accepted the Mitigation Strategy and the condition was discharged.
  13. 13. Any Questions? Rosemary.challen@rpsgroup.com

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