Dacre's volcanic ash dispersion model is central to the Met Office aviation safety forecasts. Following the 2010 eruption of Iceland's Eyjafjallajökull volcano, European airspace was closed with a cost to the global airline industry an estimated $200 million per day Dacre's assessment of the accuracy of ash models is credited with reducing airspace closure times, in particular reducing the economic impact of the 2011 Grímsvötn eruption.