This repository contains the data associated with the paper: Laboratory comparison of low-cost particulate matter sensors to measure transient events of pollution. Bulot, F.M.J.; Russell, H.S.; Rezaei, M.; Johnson, M.S.; Ossont, S.J.J.; Morris, A.K.R.; Basford, P.J.; Easton, N.H.C.; Foster, G.L.; Loxham, M.; Cox, S.J. Laboratory Comparison of Low-Cost Particulate Matter Sensors to Measure Transient Events of Pollution. Sensors 2020, 20, 2219. https://doi.org/10.3390/s20082219 It contains: - DHT22.csv measurements from the DHT22 humidity and temperature sensor - dusttrak.csv measurements from the DustTrak - ops.csv measurements from the OPS TSI 3330 - sensors.csv measurement from the low-cost PM sensors - sensors_blank.csv measurements from the low-cost PM sensors during the blank test sensors_blank.csv contains the following variables: Bin1 to Bin15: particle numbers for different bin sizes reported by the Alphasense OPCR1, as defined by its user's manual available here https://www.alphasense.com/products/optical-particle-counter/ SamplingPeriod: sampling period of the Alphasense OPCR1 in seconds SFR: sampling flow rate of the Alphasense OPCR1 in ml/s PM1, PM25, PM4, PM10: PM concentrations reported by the sensors in ug/m3. gr03um to gr100um: particle number concentrations for different bin sizes for the Plantower PMS5003, in particle per 100ml, as defined by its user's manual https://aqicn.org/air/view/sensor/spec/pms5003-manual_v2-3 n05 to n10: particle number concentrations for different bin sizes for the Sensirion SPS30, in particles per cm3, as defined by its user's manual: https://www.sensirion.com/fileadmin/user_upload/customers/sensirion/Dokumente/9.6_Particulate_Matter/Datasheets/Sensirion_PM_Sensors_Datasheet_SPS30.pdf humidity and temperature: relative humidity (%) and temperature (Celsius) recorded by the SHT35 sensors sensor: sensor identifier site: name of the air quality monitor containing the sensors exp: name of the experiment considered source: source of PM used variation: peak or stable concentration date: date and time of the experiment