London VAAC Quantitative Volcanic Ash charts

Quantitative Volcanic Ash charts (QVA) are produced in accordance with International Civil Aviation Organization (ICAO) Annex 3 requirements and are provided as well as the London Volcanic Ash Advisory Graphics (VAG) and Advisories (VAA). The lowest QVA threshold (0.2 mg/m³) matches to the areas depicted in the VAA and VAG. Both expected ash concentration and probabilistic forecast information is provided in the chart viewer below for eruptions occurring in the London Volcanic Ash Advisory Centre (VAAC) area of responsibility.

Charts will only be available during an eruption or when tests and exercises are carried out.

Charts are only provided during an eruption, please check back later.