Contribution of ammonia to the formation of fine particulate matter over Paris

The Paris megacity faces frequent fine particulate matter (PM2.5) pollution episodes in spring. At this period of the year, large numbers of the particles consist of ammonium sulfate and nitrate which are formed from ammonia (NH3) released during fertilizer spreading practices and transported from the surrounding areas to Paris. However, there is still limited knowledge of the emission sources around Paris, their magnitude and their seasonality. Using 10 years of space-borne NH3 observations provided by the Infrared Atmospheric Sounding Interferometer (IASI), Viatte et al. (2020) recently showed a high seasonal NH3 variability revealing the presence of major hotspots. The study also highlighted the importance of long-range transport in the NH3 budget over Paris and the important role of the meteorological conditions in the formation of PM2.5 in presence of NH3 in the Parisian region.

Monthly means of NH3 total columns (molecules cm−2) derived from 5 years (2013–2017) of CrIS NH3-retrieved columns. The blue cross indicates the location of Paris. Viatte et al. (2020).

More news

Highlight

Homogeneous temperature data record derived from 13 years of IASI data using an artificial neural network

Bouillon et al. (2022) recently designed a neural network to retrieve atmospheric temperatures from the IASI radiance data. This new temperature data record is validated against other datasets and a good agreement is shown. Trends were computed from this new temperature dataset over the 2008–2020 period. A general warming of the troposphere, more important at […]

05.04.2022

Highlight

Humidity levels to determine future liveability in the Arabian Peninsula

Human survivability in hot regions does not depend only on temperature, but also on humidity levels in ambient air. In fact, the body’s ability to shed heat is diminished when the air around it is saturated with humidity. The wet bulb temperature (also called heat stress) is the temperature of the air when it is […]

25.03.2022

Highlight

Trends in spectrally resolved outgoing longwave radiation from 10 years of satellite measurements

By analyzing the changes in the spectrally resolved Earth’s Outgoing Longwave Radiation (OLR) from 10 years of daily IASI observations, Whitburn et al. (2021) have highlighted the impact of large climate phenomena (in particular El Niño) on the surface and atmospheric temperature and atmospheric composition. More interesting from a longer-term climate monitoring perspective, they were […]

25.11.2021

Search