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Ammonia (NH 3) is an important air pollutant which, as a precursor of fine particulate matter, raises public health concerns. This study analyzes 2.5 years of NH 3 observations derived from ground-based (miniDOAS; differential optical absorption spectroscopy) and satellite (IASI; Infrared Atmospheric Sounding Interferometer) remote sensing instruments to quantify, for the first time, temporal variabilities (from interannual to diurnal) in NH 3 concentrations in Paris. The IASI and miniDOAS datasets are found to be in relatively good agreement (R>0.70) when atmospheric NH 3 concentrations are high and driven by regional agricultural activities. Over the investigated period (January 2020–June 2022), NH 3 average concentrations in Paris measured by the miniDOAS and IASI are 2.23 µ g m -3 and 7.10×1015 molec. cm -2 , respectively, which are lower than or equivalent to those documented in other urban areas. The seasonal and monthly variabilities in NH 3 concentrations in Paris are driven by sporadic agricultural emissions influenced by meteorological conditions, with NH 3 concentrations in spring up to 2 times higher than in other seasons. The potential source contribution function (PSCF) reveals that the close (100–200 km) east and northeast regions of Paris constitute the most important potential emission source areas of NH 3 in the megacity. Weekly cycles of NH 3 derived from satellite and ground-based observations show different ammonia sources in Paris. In spring, agriculture has a major influence on ammonia concentrations, and, in the other seasons, multi-platform observations suggest that ammonia is also controlled by traffic-related emissions. In Paris, the diurnal cycle of NH 3 concentrations is very similar to the one of NO 2 , with morning enhancements coincident with intensified road traffic. NH 3 evening enhancements synchronous with rush hours are also monitored in winter and fall. NH 3 concentrations measured during the weekends are consistently lower than NH 3 concentrations measured during weekdays in summer and fall. This is further evidence of a significant traffic source of NH 3 in Paris. [ABSTRACT FROM AUTHOR]

Ammonia (NH3) is an important air pollutant which, as precursor of fine particulate matter, raises public health issues. This study analyzes 2.5-years of NH3 observations derived from ground-based (miniDOAS) and satellite (IASI) remote sensing instruments to quantify, for the first time, temporal variabilities (from interannual to diurnal) of NH3 concentrations in Paris. The IASI and miniDOAS datasets are found to be in relatively good agreement (R > 0.70) when atmospheric NH3 concentrations are high and driven by regional agricultural activities. Over the investigated period (January 2020–June 2022), NH3 average concentrations in Paris measured by the miniDOAS and IASI are 2.23 μg.m−3 and 7.10 × 1015 molecules.cm−2, respectively, which are lower or equivalent to those documented in urban areas. The seasonal and monthly variabilities of NH3 concentrations in Paris are driven by sporadic agricultural emissions influenced by meteorological conditions, with NH3 concentrations in spring up to 2 times higher than in other seasons. The potential source contribution function (PSCF) reveals that the close (100–200 km) east and northeast regions of Paris constitute the most important potential emission source areas of NH3 in the megacity. Weekly cycles of NH3 derived from satellite and ground-based observations show different ammonia sources in Paris. In spring, agriculture has a major influence on ammonia concentrations and, in the other seasons, multi-platform observations suggest that ammonia is also controlled by traffic-related emissions. In Paris, the diurnal cycle of NH3 concentrations is very similar to the one of NO2, with morning enhancements coincident with intensified road traffic. NH3 evening enhancements synchronous with rush hours are also monitored in winter and fall. NH3 concentrations measured during the weekends are consistently lower than NH3 concentrations measured during weekdays in summer and fall. This is a further evidence of a significant traffic source of NH3 in Paris. [ABSTRACT FROM AUTHOR]