Abstract Over the last 10 years, as a possible alternative to the conventional approach to air quality monitoring, real-time monitoring systems that use low-cost sensors and sensor platforms have been frequently applied. Generally, the long-term characteristics of low-cost PM sensors and monitoring have not been thoroughly documented except for a few widely used sensors and monitors. This article addresses the laboratory and field validation of three low-cost PM monitors of the same type that use the NOVA SDS011 PM sensor module over a 1-year period. In outdoor environments, we co-located low-cost PM monitors with GRIMM EDM180 monitors at the National Air Quality Monitoring stations. In indoor environments, we co-located them with a Turnkey Osiris PM monitor. Several performance aspects of the PM monitors were examined: operational data coverage, linearity of response, accuracy, precision, and inter-sensor variability. The obtained results show that inter-monitor R values were typically higher than 0.95 regardless of the environment. The tested monitors demonstrate high linearity in comparison with PM10 and PM2.5 concentrations measured in outdoor air with reference-equivalent instrumentation with R2 values ranging from 0.52 up to 0.83. In addition, very good agreement ( R2 values ranging from 0.93 up to 0.97) with the gravimetric PM10 and PM2.5 method is obtained in the indoor environment (30 < RH < 70%). High RH (over 70%) negatively affected the PM monitors’ response, especially in the case of PM10 concentrations (high overestimation). application/pdf 3480528 bytes Keywords Air pollution, Monitoring, Particulate matter, Low-cost PM monitor, NOVA SDS011 PM sensor. info:eu-repo/semantics/article https://unilib.phaidrabg.rs/o:5859 doi:10.1007/s10661-022-10290-7 cobiss:136676105 ISSN: 1573-2959 Environmental monitoring and assessment volume: 194 number: 595 Performance assessment of NOVA SDS011 low‑cost PM sensor in various microenvironments Božilov, Aca Tasić, Viša Živković, Nenad Lazović, Ivan Blagojević, Milan Mišić, Nikola Topalović, Dušan http://creativecommons.org/licenses/by/4.0/legalcode eng 2022