This file contains the concentrations of Total volatile organic compounds (TVOC) outdoors in Barão Geraldo, Campinas, Brazil. The data was collected through the ARDUÍNO NANO microcontroller, CCS811 micromachined metal oxide (MOX) gas sensor for air quality monitoring, with a TVOC range from 0ppb to 1187ppb (0 ppm to 1.187ppm). The sensor, while not discriminating the quantity and diversity of VOCs in the air, provides a low-cost technique for real-time air quality monitoring. The dataset shows hourly outdoor TVOC concentrations over one year (2022).