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A sensors network based on 8 stationary nodes distributed in Bari (Southern Italy) has<br />been deployed for urban air quality monitoring during advection events of Saharan dust in the<br />period 2015&#8315;2017. The low-cost sensor-systems have been installed in specific sites (buildings,<br />offices, schools, streets, airport) to assess the PM10 concentration at high spatial and temporal<br />resolution in order to supplement the expensive official air monitoring stations for citizen science<br />purposes. Continuous measurements were performed by a cost-effective optical particle counter<br />(PM10), including temperature and relative humidity sensors. They are operated to assess the<br />performance during a long-term campaign (July 2015&#8315;December 2017) of 30 months for smart cities<br />applications. The sensor data quality has been evaluated by comparison to the reference data of the<br />9 Air Quality Monitoring Stations (AQMS), managed by local environmental agency (ARPA-Puglia)<br />in the Bari city.