Floating air particles following disasters and other largescale geological events can have a lasting impact on life on Earth. Volcanic ash can be projected up to the stratosphere and halt air traffic by lingering in the atmosphere for months. Particles from industrial accidents have the potential to travel full hemispheres before falling to the ground. A new model drawing on chaos theory, and published in this week's Chaos, from AIP Publishing, looks to help predict how particles move in such events with an eye toward potential applications for geoengineering to combat climate change.