Digital photographic method to quantify black carbon in ambient aerosols

Du, Ke; Yang, Wang; Chen, Bing; Wang, Kai; Chen, Jinsheng; Zhang, Fuwang

doi:10.1016/j.atmosenv.2011.09.035

Cited by 7 publications

(6 citation statements)

References 43 publications

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“…Like other time-integrated average optical methods for monitoring LAC (e.g., smoke stain reflectometer), digital image-based methods estimate the reflectance or color of a sample collected on a filter (e.g., quartz or PTFE filter) and then estimate the LAC loading of the filter based on field calibration with other optical or thermal-optical methods for LAC. Digital image-based methods have been developed using cellphone cameras [ 10 , 30 ], digital cameras [ 22 , 31 ], colorimeters [ 32 , 33 ], and scanners [ 34 , 35 , 36 ] and have been tested in households that use solid fuels in China and India [ 22 , 36 , 37 ]. Based on evaluation with thermal-optical methods and time-integrated average optical methods for LAC, digital image-based analysis methods can reliably estimate shorter-term (~hours) average LAC concentrations [ 10 , 13 , 22 , 30 , 31 , 32 , 33 , 34 , 35 , 36 ].…”

Section: Introductionmentioning

confidence: 99%

“…We build on prior work by combining passive sampling with digital image analysis [ 17 , 24 ]: two low-cost methods which have been applied separately (but not together) for measuring LAC (or other components of PM) indoors. Previous studies have applied digital image analysis with active sample collection to measure LAC concentration based on filter reflectance [ 10 , 13 , 22 , 30 , 31 , 32 , 33 , 34 , 35 , 36 ], and, separately, previous studies have applied passive sample collection with other analysis methods (e.g., electron microscopy [ 19 ], chemical analysis methods [ 29 ]) to measure PM components.…”

Section: Introductionmentioning

confidence: 99%

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Developing a Low-Cost Passive Method for Long-Term Average Levels of Light-Absorbing Carbon Air Pollution in Polluted Indoor Environments

Clark

Sreekanth

Bekbulat

et al. 2020

Sensors

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We propose a low-cost passive method for monitoring long-term average levels of light-absorbing carbon air pollution in polluted indoor environments. Building on prior work, the method here estimates the change in reflectance of a passively exposed surface through analysis of digital images. To determine reproducibility and limits of detection, we tested low-cost passive samplers with exposure to kerosene smoke in the laboratory and to environmental pollution in 20 indoor locations. Preliminary results suggest robust reproducibility (r = 0.99) and limits of detection appropriate for longer-term (~1–3 months) monitoring in households that use solid fuels. The results here suggest high precision; further testing involving “gold standard” measurements is needed to investigate accuracy.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Developing a Low-Cost Passive Method for Long-Term Average Levels of Light-Absorbing Carbon Air Pollution in Polluted Indoor Environments

Clark

Sreekanth

Bekbulat

et al. 2020

Sensors

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“…ATN of particle-loaded filters were measured using a custom laser/LED transmissometer at 532 nm and 880 nm wavelength respectively (The 532 nm wavelength laser was used as a substitute for 880 nm LED source when the LED was not available). The laser transmissometer consists of a laser module (Model GM-CF04-5, 532 nm, Beta Electronics, Ohio, USA) and a photon detector (Model DET36A, Thorlabs, New Jersey, USA) (Du et al, 2011). The LED transmissometer consists of a LED module (Model SL2420, 880 nm, Advanced Illumination, Rochester, UK) and the photon detector.…”

Section: Measurements Of Optical Attenuation and Bc Loadingmentioning

confidence: 99%

Temporal Variation of Mass Absorption Efficiency of Black Carbon at Urban and Suburban Locations

Wang

Liu

Shi

et al. 2013

Aerosol Air Qual. Res.

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The mass absorption efficiency (MAE) of black carbon (BC) was measured for the ambient aerosols in urban and suburban areas and exhaust plumes from motor vehicles from September 2010 to September 2011 in Xiamen, China. Ambient aerosols, collected on quartz fiber filters, were analyzed for BC loadings using an OC/EC Carbon Aerosol Analyzer and measured for optical attenuations with a laser/LED transmissometer. The MAE of BC in Xiamen shows a large temporal and spatial variability, varying from 0.47 to 5.15 m 2 /g. In the same month (May 2011), the average MAE of BC in suburban area (0.50 m 2 /g) was one third that in urban area (1.50 m 2 /g), suggesting that the variance of MAE was related to the specific emission sources of BC. Here we report the large variation in MAE of BC measured during different sampling times and for different sources in Xiamen. The average MAE was 1.69 m 2 /g and the coefficient of variance was 52%. Factors contributing to the variability were also discussed, as well as the uncertainties caused by different carbon analysis methods, working wavelengths for optical attenuation measurements, and relative humidity when measuring the optical attenuation of the aerosol filters. The results suggest that if a constant value of MAE within the range of 0.47-5.15 m 2 /g is used to quantify the BC concentration, then this would bias the results with a maximum factor of 11. Site-specific values of MAE are recommended for long-term stationary monitoring of ambient BC in air quality monitoring stations.

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“…Such an approach was introduced by Wang et al [8] aiming to quantify the loading of black carbon on quartz fiber filters with digital photographic methods. Field results demonstrated that this approach provides measurements as precise and accurate as the ones acquired with expensive instruments, while it exhibits short analysis time and easy operation.…”

Section: Introductionmentioning

confidence: 99%

hackAIR: Towards Raising Awareness about Air Quality in Europe by Developing a Collective Online Platform

Kosmidis

Syropoulou

Tekes

et al. 2018

IJGI

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Abstract:Although air pollution is one of the most significant environmental factors posing a threat to human health worldwide, air quality data are scarce or not easily accessible in most European countries. The current work aims to develop a centralized air quality data hub that enables citizens to contribute to air quality monitoring. In this work, data from official air quality monitoring stations are combined with air pollution estimates from sky-depicting photos and from low-cost sensing devices that citizens build on their own so that citizens receive improved information about the quality of the air they breathe. Additionally, a data fusion algorithm merges air quality information from various sources to provide information in areas where no air quality measurements exist.

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Digital photographic method to quantify black carbon in ambient aerosols

Cited by 7 publications

References 43 publications

Developing a Low-Cost Passive Method for Long-Term Average Levels of Light-Absorbing Carbon Air Pollution in Polluted Indoor Environments

Developing a Low-Cost Passive Method for Long-Term Average Levels of Light-Absorbing Carbon Air Pollution in Polluted Indoor Environments

Temporal Variation of Mass Absorption Efficiency of Black Carbon at Urban and Suburban Locations

hackAIR: Towards Raising Awareness about Air Quality in Europe by Developing a Collective Online Platform

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