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Low-cost optical sensors for PM measurement are desirable for monitoring exposure closer to the personal level and particularly suited for developing spatiotemporally dense city sensor networks. However, questions remain over the accuracy and reliability of the data they produce, particularly regarding the influence of environmental parameters such as humidity and temperature, and with varying PM sources and concentration profiles. In this study, eight units each of five different models of commercially available low-cost optical PM sensors (40 individual sensors in total) were tested under controlled laboratory conditions, against higher-grade instruments for: lower limit of detection, response time, responses to sharp pollution spikes lasting &lt;1    min   , and the impact of differing humidity and PM source. All sensors detected the spikes generated with a varied range of performances depending on the model and presenting different sensitivity mainly to sources of pollution and to size distributions with a lesser impact of humidity. The sensitivity to particle size distribution indicates that the sensors may provide additional information to PM mass concentrations. It is concluded that improved performance in field monitoring campaigns, including tracking sources of pollution, could be achieved by using a combination of some of the different models to take advantage of the additional information made available by their differential response.<\/jats:p>","DOI":"10.3390\/s20082219","type":"journal-article","created":{"date-parts":[[2020,4,15]],"date-time":"2020-04-15T09:19:50Z","timestamp":1586942390000},"page":"2219","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":82,"title":["Laboratory Comparison of Low-Cost Particulate Matter Sensors to Measure Transient Events of Pollution"],"prefix":"10.3390","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3337-4650","authenticated-orcid":false,"given":"Florentin Michel Jacques","family":"Bulot","sequence":"first","affiliation":[{"name":"Faculty of Engineering and Physical Sciences, University of Southampton, Southampton SO17 1BJ, UK"},{"name":"Southampton Marine and Maritime Institute, University of Southampton, Southampton SO16 7QF, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0896-6371","authenticated-orcid":false,"given":"Hugo Savill","family":"Russell","sequence":"additional","affiliation":[{"name":"Danish Big Data Centre for Environment and Health (BERTHA), Aarhus University, DK-4000 Roskilde, Denmark"},{"name":"Airlabs Denmark, Lers\u00f8 Park All\u00e9 107, DK-2100 Copenhagen \u00d8, Denmark"},{"name":"Department of Environmental Science, Atmospheric Measurement, Aarhus University, Frederiksborgvej 399, DK-4000 Roskilde, Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mohsen","family":"Rezaei","sequence":"additional","affiliation":[{"name":"Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen \u00d8, 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UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5465-411X","authenticated-orcid":false,"given":"Andrew Kevin Richard","family":"Morris","sequence":"additional","affiliation":[{"name":"National Oceanography Centre, Southampton SO14 3ZH, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6058-8270","authenticated-orcid":false,"given":"Philip James","family":"Basford","sequence":"additional","affiliation":[{"name":"Faculty of Engineering and Physical Sciences, University of Southampton, Southampton SO17 1BJ, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9168-3294","authenticated-orcid":false,"given":"Natasha Hazel Celeste","family":"Easton","sequence":"additional","affiliation":[{"name":"Southampton Marine and Maritime Institute, University of Southampton, Southampton SO16 7QF, UK"},{"name":"School of Ocean and Earth Science, National Oceanography Centre, University of Southampton, Southampton SO14 3ZH, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gavin Lee","family":"Foster","sequence":"additional","affiliation":[{"name":"Southampton Marine and Maritime Institute, University of Southampton, Southampton SO16 7QF, UK"},{"name":"School of Ocean and Earth Science, National Oceanography Centre, University of Southampton, Southampton SO14 3ZH, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6459-538X","authenticated-orcid":false,"given":"Matthew","family":"Loxham","sequence":"additional","affiliation":[{"name":"Southampton Marine and Maritime Institute, University of Southampton, Southampton SO16 7QF, UK"},{"name":"Faculty of Medicine, University of Southampton, Southampton SO17 1BJ, UK"},{"name":"National Institute for Health Research, Southampton Biomedical Research Centre, Southampton SO16 6YD, UK"},{"name":"Institute for Life Sciences, 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