Industrial and agricultural ammonia point sources exposed

A high-resolution map (~1km²) of the global atmospheric distribution of ammonia was generated combining almost a decade of IASI measurements (Van Damme et al., 2018). From it, they identify, categorize and quantify over 200 hotspots that could be traced back to either a single or a cluster of agricultural and industrial point sources. One natural hotspot was also determined. This research has shown that emissions from such sources were drastically underestimated in the current bottom-up inventories, with 2/3 of the identified point sources completely absent. The IASI measurements also allows observing changes in human activities. Opening and closure of industrial sites were identified in Eastern Europe and China, as well as agriculture in transition in South America.

Interactive ammonia worldmap available at:

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First quantification of the photochemical production of lowermost tropospheric ozone from satellite observations

The photochemical production of lowermost tropospheric ozone (located below 3 km of altitude) was quantified for the first time only using satellite data (Cuesta et al., 2018). This is the first daily quantification made so close to the surface, and therefore being directly related to air quality. These results were obtained with the only satellite […]



Decrease in tropospheric O3 levels of the Northern Hemisphere

Wespes et al. (2018) present the global fingerprints of recent changes in the tropospheric O3 levels measured by IASI over 2008 – 2017. Using appropriate multivariate regression methods, we discriminate significant anthropogenic trends from various modes of natural variability captured by IASI. A band-like pattern of significant negative trends of ~|0.5| DU/yr on average is […]



O3 variability in the troposphere as observed by IASI

A study by Wespes et al. (2017) presents global patterns of the main geophysical drivers of IASI O3 variations, obtained by applying appropriate annual and seasonal multivariate regression models on time series of spatially gridded averaged O3. They show that the models are able to explain most of the O3 variability captured by IASI and […]