Mapping Urban Methane Sources in Paris, France

Megacities, with their large and complex infrastructures, are significant sources of methane emissions. To develop a simple, low-cost methodology to quantify these globally important sources, this study focuses on mobile measurements (CH4) its isotopic composition in Paris. Data collected between September 2018 March 2019 resulted 17 days measurements, which provided spatial distribution street-level mixing ratios, source type identification, emission quantification. Consequently, 90 potential leaks were detected Paris sorted into three leak categories: natural gas network emissions (63%), sewage (33%), from heating furnaces buildings (4%). The latter category has not previously been reported urban studies. Accounting for the detectable ground, total estimated CH4 rate was 5000 L/min (190 t/yr), largest contribution (56%). This ranks as city medium Two areas clusters found, where 22% 56% observed. Our findings suggest that network, system, ideal targets reduction efforts