@techreport{marc2018evaluation,
  title = {Evaluation of the air quality of the City of Barcelona 2018 Report}
  author = {Marc Rico; Anna Gómez; Helena Pañella; Jaume Arimon; Laia Font; Marc Marí},
  url = {https://www.aspb.cat/wp-content/uploads/2019/09/Informe_qualitat-aire-2018.pdf},
  year = {2018}
}