The AQMRC were commissioned by Gatwick Airport Ltd to review the robustness of emission factors used as the basis for modelling within Defra’s proposed Air Quality Plan. Gatwick’s consultation response and our contribution to it, can be found here: http://gatwickairport.com/globalassets/publicationfiles/business_and_community/all_public_publications/second_runway/airports_commission/final_submitted_response_to_draft_air_quality_plan_3nov15.pdf