ENVISA was mandated by the UK National Air Traffic Services (NATS) to assess the impact of new aircraft departure procedures on local air quality in Southeast England. An air quality study at a major airport in the area was carried out, based on the 2006 traffic. Concentration contours were produced and compared between current and future procedures. In addition, concentrations at specific receptor locations corresponding to sensitive areas were calculated.
ENVISA's main tasks were to: