Successfully completed in rooftop laboratory testing. We found that 75 % of attempted samples were We conducted a trial deployment to assess the reliability and mechanical robustness of AMODv2 units. We propose annual recalibration to mitigate potential errors from calibration drift. In a test of 15-monthĬalibration stability performed on 16 AMOD units, we observed median changes to calibration constant values of −7.14 %, −9.64 %, −0.75 %, and −2.80 % at 440, 500, 675, and 870 nm, respectively. Source of error between AMODv2s and reference units. Individual units, particularly due to calibration drift, as the primary Level to AMODv2 instrument error and found that the mean absolute error in the AMODv2 deviated by less than 0.01 AOD units between clear days andĮlevated-AOD days and across all wavelengths. We derived empirical relationships relating the reference AOD We observed close agreementīetween AMODv2s and the reference instrument with mean absolute errors ofĠ.04, 0.06, 0.03, and 0.03 AOD units at 440, 500, 675, and 870 nm, Robotics Network) instrument as the reference method at AOD levels rangingįrom 0.02 ± 0.01 to 1.59 ± 0.01. We present the results of a 9 d AOD validationĬampaign where AMODv2 units were co-located with an AERONET (Aerosol AMODv2 samples are configured using a smartphone application,Īnd sample data are made available via data streaming to a companion website Time-integrated gravimetric filter measurements of particle mass andĬomposition. Time-resolved optical PM 2.5 measurements and a pump/cyclone system for Also included are a Plantower PMS5003 sensor for Semicontinuous, multiwavelength (current version at 440, 500, 675, and 870 nm) AOD sampling. System alongside a set of four optically filtered photodiodes for The sampler includes a motorized Sun tracking The AMODv2 measures AOD and PM 2.5 atĢ0 min time intervals. This paper, we present an updated version of the AMOD, known as AMODv2,įeaturing design improvements and extended validation to address the Ford et al. (2019)ĭescribe a citizen-science field deployment of the AMODv1 device. Wendt et al. (2019) described the development and validation of aįirst-generation device for low-cost measurement of AOD and PM 2.5: theĪerosol Mass and Optical Depth (AMODv1) sampler. Temporal configurations currently lacking proper characterization. Low-cost sensors which can be more practically deployed in spatial and Sampling coverage but does not adequately characterize community-level air Measurements of surface-level PM 2.5 concentrations at a global scale.Įxisting PM 2.5 measurement infrastructure provides broad PM 2.5 Consequently, a need exists for accurate, distributed (PM 2.5) has a negative impact on public health, the environment, andĮarth's climate. Atmospheric particulate matter smaller than 2.5 µm in diameter
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