Impact of wildfires on air quality as seen by IAGOS in-situ measurements

For thirty years, the European Research Infrastructure IAGOS (In-Service Aircraft for a Global Observing System) has been equipping commercial aircraft with instruments to measure atmospheric composition on long-haul flights around the world.  Ten aircraft are currently equipped with IAGOS instruments to measure ozone, and the precursors carbon monoxide and nitrous oxides from the surface to the upper-troposphere during landing and take-off at worldwide airports,  and at cruise altitude where we observe the long-range transport of polluted airmasses. We analyse the transport of biomass burning pollutants from the intense Canadian wildfire seasons of 2023 and 2024 which impacted air-quality in North America and in Europe, and the extreme wildfires over the Amazon in 2024 that impacted air quality in South American cities.  The significance of these events is interpreted within the context of the 30-year climatology. The events will be compared with forecasts and analyses from the Copernicus Atmosphere Monitoring Service's global and regional models (projects CAMS2_82 and CAMS2_83) and we further  highlight the role of IAGOS  in developing air-quality networks in susceptible urban areas (project RI-URBANS) and the impacts of heatwaves and wildfires on air-quality in a changing climate (project IRISCC).