VOC mixing ratios measured @ two traffic tunnels in the Metropolitan Area of São Paulo (MASP), Brazil Samplings @ Jânio Quadros Tunnel (-46° 41' 36.28" W, -23° 35' 15.81 S") carried out during November 4 - 13, 2018 Samplings @ Rodoanel Tunnel (-46° 47' 43.85 W", -23° 27' 38.94 S") carried out during October 26 - November 3, 2018 VOC were collected using sampling canisters and measured by GC-FID. Samples were collected at a constant flow rate (~ 2ml/min) for approximately 8 hours. Contact: thiago.nogueira@iag.usp.br or pamela.dominutti@gmail.com This work was financially supported by the project “Chemical and toxicological SOurce PROfiling of particulate matter in urban air (SOPRO)”, POCI-01-0145-FEDER-029574, funded by FEDER, through Compete 2020 - Programa Operacional Competitividade e Internacionalização (POCI), by national funds (OE), through FCT/MCTES, and by the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP, São Paulo Research Foundation; Grants no. 18/07848-9).