“…Therefore, data quality protocols are an essential part of crowdsourcing-driven research. Although participatory research faces methodological challenges such as biases in data collection(Nimbalkar and Tripathi, 2016, English et al, 2018), CS has been proven to be a source of trusted geospatial data(Sheppard and Terveen, 2011, Lin et al, 2015, Kosmala et al, 2016, Parrish et al, 2018, including for health risk mapping(Maantay, 2007, Keddem et al, 2015, Palmer et al, 2017 and risks caused by poor air quality(Bastl et al, 2017, Penza et al, 2017, Khasha et al, 2018, Kankanamge et al, 2019. The data quality determines its usefulness(Choi et al, 2016, Chmielewski et al, 2018.…”