English: According to a recent study published by the European Public Health Alliance (EPHA), the health sector costs of air pollution from roads are higher in London than in any other city in Europe. The research analysed the Eurostat pollution and demographic data from 2018 and WHO recommendations over an unprecedented number of sites across 30 different countries, namely the EU27, the UK, Norway, and Switzerland. The research quantifies the monetary value of premature death, hospital treatment, lost working days and other health costs caused by particulate matter, ozone and nitrogen dioxide. Diesel vehicles are one of the main contributors to the atmospheric pollution as they are the primary source of nitrogen dioxide (NO2) in the air. In conjunction with particulate matter and ground-level ozone (O3), nitrogen dioxide is responsible for nearly 500,000 premature deaths across Europe every year. This explains why the pollution level, combined with the size of the city, is a key factor in contributing to total healthcare costs. The study highlights that London, in particular, suffers from the highest social healthcare costs, at € 11,44bn a year, well ahead of other European cities such as Bucharest (€6.38bn), Berlin (€5.27bn), Warsaw (€4.25bn), Rome (€4.17bn), and Paris (€3.53bn). This map has been obtained by computing the average atmospheric concentration of nitrogen dioxide in the NO2 measurements provided by the Copernicus Sentinel-5P mission from 12 to 22 September 2020. The image shows this distribution over a large area of southern England, visually centered in the city of London. Nitrogen Dioxide is an important atmospheric pollutant affecting air quality: detailed and continuous observations of NO2 are necessary to better assess its impact on climate and atmospheric pollution. The TROPOspheric Monitoring Instrument (TROPOMI) onboard the Copernicus Sentinel-5P satellite allows daily measurements of NO2 levels with an unprecedented level of detail on a global scale.