Traceable PM2.5 and PM10 Calibration of Low-Cost Sensors with Ambient-like Aerosols Generated in the Laboratory

Horender, Stefan; Tancev, Georgi; Auderset, Kevin; Vasilatou, Konstantina

doi:10.3390/app11199014

Cited by 8 publications

(5 citation statements)

References 31 publications

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“…In the fourth paper, the focus is improving the effectiveness of low-cost sensors for air quality monitoring by advancing calibration methods. This study supports air quality control efforts and promotes more reliable and accurate monitoring and management practices [4]. The fifth paper presents the development of a multi-item air quality monitoring system that enables the real-time monitoring of various parameters.…”

Section: Advances In Gaseous and Particulate Air Pollutants Measurementmentioning

confidence: 55%

Advances in Gaseous and Particulate Air Pollutants Measurement

Kim

2023

Applied Sciences

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Section: Advances In Gaseous and Particulate Air Pollutants Measurementmentioning

confidence: 55%

Advances in Gaseous and Particulate Air Pollutants Measurement

Kim

2023

Applied Sciences

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“…It is usually employed for atmospheric measurements. However, when used to characterize the size distribution in a flowing aerosol, it is common to connect a sampling tube to the inlet of the instrument [23,24].…”

Section: Optical Aerosol Spectrometer (Oas)mentioning

confidence: 99%

Comparison of aerosol spectrometers : accounting for evaporation and sampling losses

Lefebvre,

Succar,

Bédard

et al. 2024

Meas. Sci. Technol.

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Measuring aerosol size distribution with precision is critical to understand the transmission of pathogens causing respiratory illnesses and to identify risk mitigation strategies. It is however a challenging task as the size of pathogen-carrying particles evolves over time due to evaporation. Although measurement techniques well established in the field of aerosol science are often used to characterize bioaerosols, their performance is seldom assessed with respect to evaporation and deposition in sampling lines. Four instruments providing aerosol size distribution were compared using oil and water-based particles. They each rely on different measurement principles: phase doppler anemometry, light scattering, electrical mobility and aerodynamic impaction. Size distributions of oil-based particles showed consistency across different measurement instruments, but significant discrepancies arose for water-based particles undergoing evaporation. These larger differences result from both evaporation and particle deposition in transit between the sampling point and the measurement inside the instrument. Phase doppler anemometry was best suited for precise size distribution measurement, as it eliminates the need for a sampling line, thereby preventing particle loss or evaporation during transit. With this instrument as a reference, empirical correction factors for evaporation and deposition were derived from dimensionless numbers and experimental data, enabling quantitative assessment of bioaerosol size distribution using different instruments. To obtain the size distribution at the source of the aerosol generation, complete drying of a salt solution was performed. Using the complete drying technique and accounting for losses, sampling instruments can reliably provide this critical information and allow for thorough risk assessment in the context of airborne transmission.

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“…Their photometric measuring method operates via transmission effects, which results in a wider detectable particle-size range than with the SMPS. There are already a number of studies with the mentioned low-cost sensors [39][40][41][42][43][44], where the comparison to different laboratory measuring devices (Optical Particle Counter, SMPS, etc.) showed that the PM2.5 values are comparable [39,41,43].…”

Section: Measurement Devicesmentioning

confidence: 99%

Suitability of Low-Cost Sensors for Submicron Aerosol Particle Measurement

Stoll,

Kerner,

Paas

et al. 2023

ASI

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The measurement and assessment of indoor air quality in terms of respirable particulate constituents is relevant, especially in light of the COVID-19 pandemic and associated infection events. To analyze indoor infectious potential and to develop customized hygiene concepts, the measurement monitoring of the anthropogenic aerosol spreading is necessary. For indoor aerosol measurements usually standard lab equipment is used. However, these devices are time-consuming, expensive and unwieldy. The idea is to replace this standard laboratory equipment with low-cost sensors widely used for monitoring fine dust (particulate matter—PM). Due to the low acquisition costs, many sensors can be used to determine the aerosol load, even in large rooms. Thus, the aim of this work is to verify the measurement capability of low-cost sensors. For this purpose, two different models of low-cost sensors are compared with established laboratory measuring instruments. The study was performed with artificially prepared NaCl aerosols with a well-defined size and morphology. In addition, the influence of the relative humidity, which can vary significantly indoors, on the measurement capability of the low-cost sensors is investigated. For this purpose, a heating stage was developed and tested. The results show a discrepancy in measurement capability between low-cost sensors and laboratory measuring instruments. This difference can be attributed to the partially different measuring method, as well as the different measuring particle size ranges. The determined measurement accuracy is nevertheless good, considering the compactness and the acquisition price of the low-cost sensors.

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Traceable PM2.5 and PM10 Calibration of Low-Cost Sensors with Ambient-like Aerosols Generated in the Laboratory

Cited by 8 publications

References 31 publications

Advances in Gaseous and Particulate Air Pollutants Measurement

Advances in Gaseous and Particulate Air Pollutants Measurement

Comparison of aerosol spectrometers : accounting for evaporation and sampling losses

Suitability of Low-Cost Sensors for Submicron Aerosol Particle Measurement

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