IoT sensor nodes for air pollution monitoring: A review

Air quality is an important environmental concern, as it is strictly related to human health risks and adverse eff ects on it. Monitoring air pollutants and diff erent ancillary parameters is a feasible and crucial approach to address this challenge. This task typically involves high expenses in case measurements are carried out by using conventi onal measurement instruments and human operators. However, uti lizing measurement systems with low-cost sensors can reduce the overall implementati on eff ort. The aim of this paper is to describe the sensor node architecture applicable to a general monitoring system and based on this structure, review diff erent current low-cost measurement system proposals for outdoor air quality monitoring.