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• W3205371102 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> <span id=page656/>The Plantower PMS5003 sensors (PMS) used in the PurpleAir monitor PA-II-SD configuration (PA-PMS) are equivalent to cell-reciprocal nephelometers using a 657 nm perpendicularly polarized light source that integrates light scattering from 18 to 166<span class=inline-formula>^∘</span>. Yearlong field data at the National Oceanic and Atmospheric Administration's (NOAA) Mauna Loa Observatory (MLO) and Boulder Table Mountain (BOS) sites show that the 1 h average of the PA-PMS first size channel, labeled “<span class=inline-formula>></span> 0.3 <span class=inline-formula>µ</span>m” (“CH1”), is highly correlated with submicrometer aerosol scattering coefficients at the 550 and 700 nm wavelengths measured by the TSI 3563 integrating nephelometer, from 0.4 to 500 Mm<span class=inline-formula>^−1</span>. This corresponds to an hourly average submicrometer aerosol mass concentration of approximately 0.2 to 200 <span class=inline-formula>µ</span>g m<span class=inline-formula>^−3</span>. A physical–optical model of the PMS is developed to estimate light intensity on the photodiode, accounting for angular truncation of the volume scattering function as a function of particle size. The model predicts that the PMS response to particles <span class=inline-formula>></span> 0.3 <span class=inline-formula>µ</span>m decreases relative to an ideal nephelometer by about 75 % for particle diameters <span class=inline-formula>≥</span> 1.0 <span class=inline-formula>µ</span>m. This is a result of using a laser that is polarized, the angular truncation of the scattered light, and particle losses (e.g., due to aspiration) before reaching the laser. It is shown that CH1 is linearly proportional to the model-predicted intensity of the light scattered by particles in the PMS laser to its photodiode over 4 orders of magnitude. This is consistent with CH1 being a measure of the scattering coefficient and not the particle number concentration or particulate matter concentration. The model predictions are consistent with data from published laboratory studies which evaluated the PMS against a variety of aerosols. Predictions are then compared with yearlong fine aerosol size distribution and scattering coefficient field data at the BOS site. Field data at BOS confirm the model prediction that the ratio of CH1 to the scattering coefficient would be highest for aerosols with median scattering diameters <span class=inline-formula><</span> 0.3 <span class=inline-formula>µ</span>m. The PMS detects aerosols smaller than 0.3 <span class=inline-formula>µ</span>m diameter in proportion to their contribution to the scattering coefficient. The results of this study indicate that the PMS is not an optical particle counter and that its six size fractions are not a meaningful representation of particle size distribution. The relationship between the PMS 1 h average CH1 and <span class=inline-formula><i>b</i>_sp1</span>, the scattering coefficient in Mm<span class=inline-formula>^−1</span> due to particles below 1 <span class=inline-formula>µ</span>m aerodynamic diameter, at wavelength 550 nm, is found to be <span class=inline-formula><i>b</i>_sp1</span> <span class=inline-formula>=</span> 0.015 <span class=inline-formula>±</span> 2.07 <span class=inline-formula>×</span> 10<span class=inline-formula>^−5</span> <span class=inline-formula>×</span> CH1, for relative humidity below 40 %. The coefficient of determination <span class=inline-formula><i>r</i>²</span> is 0.97. This suggests that the low-cost and widely used PA monitors can be used to measure and predict the submicron aerosol light scattering coefficient in the mid-visible nearly as well as integrating nephelometers. The effectiveness of the PA-PMS to serve as a PM<span class=inline-formula>_2.5</span> mass concentration monitor is due to both the sensor behaving like an imperfect integrating nephelometer and the mass scattering efficiency of ambient PM<span class=inline-formula>_2.5</span> aerosols being roughly constant." @default.
• W3205371102 created "2021-10-25" @default.
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• W3205371102 date "2021-10-15" @default.
• W3205371102 modified "2023-09-27" @default.
• W3205371102 title "Nice model and useful evaluation of the PurpleAir sensor for a unique, more direct application" @default.
• W3205371102 doi "https://doi.org/10.5194/amt-2021-170-rc1" @default.
• W3205371102 hasPublicationYear "2021" @default.
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