Community Air Sensor Network (CAIRSENSE) project: evaluation of low-cost sensor performance in a suburban environment in the southeastern United States
Advances in air pollution sensor technology have enabled the development of small and low-cost systems to measure outdoor air pollution. The deployment of a large number of sensors across a small geographic area would have potential benefits to supplement traditional monitoring networks with add...
| Main Authors: | , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2016-11-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | https://www.atmos-meas-tech.net/9/5281/2016/amt-9-5281-2016.pdf |
| _version_ | 1819266346413719552 |
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| author | W. Jiao G. Hagler R. Williams R. Sharpe R. Brown D. Garver R. Judge M. Caudill J. Rickard M. Davis L. Weinstock S. Zimmer-Dauphinee K. Buckley |
| author_facet | W. Jiao G. Hagler R. Williams R. Sharpe R. Brown D. Garver R. Judge M. Caudill J. Rickard M. Davis L. Weinstock S. Zimmer-Dauphinee K. Buckley |
| author_sort | W. Jiao |
| collection | DOAJ |
| description | Advances in air pollution sensor technology have enabled the development of
small and low-cost systems to measure outdoor air pollution. The deployment
of a large number of sensors across a small geographic area would have
potential benefits to supplement traditional monitoring networks with
additional geographic and temporal measurement resolution, if the data
quality were sufficient. To understand the capability of emerging air sensor
technology, the Community Air Sensor Network (CAIRSENSE) project deployed low-cost, continuous, and commercially available air pollution sensors at a
regulatory air monitoring site and as a local sensor network over a
surrounding ∼ 2 km area in the southeastern United States.
Collocation of sensors measuring oxides of nitrogen, ozone, carbon monoxide,
sulfur dioxide, and particles revealed highly variable performance, both in
terms of comparison to a reference monitor as well as the degree to which
multiple identical sensors produced the same signal. Multiple ozone, nitrogen
dioxide, and carbon monoxide sensors revealed low to very high correlation
with a reference monitor, with Pearson sample correlation coefficient (r)
ranging from 0.39 to 0.97, −0.25 to 0.76, and −0.40 to 0.82, respectively. The
only sulfur dioxide sensor tested revealed no correlation (<i>r</i> < 0.5)
with a reference monitor and erroneously high concentration values. A wide
variety of particulate matter (PM) sensors were tested with variable results
– some sensors had very high agreement (e.g., <i>r</i> = 0.99) between identical
sensors but moderate agreement with a reference PM<sub>2.5</sub> monitor
(e.g., <i>r</i> = 0.65). For select sensors that had moderate to strong
correlation with reference monitors (<i>r</i> > 0.5), step-wise multiple
linear regression was performed to determine if ambient temperature, relative
humidity (RH), or age of the sensor in number of sampling days could be used
in a correction algorithm to improve the agreement. Maximum improvement in
agreement with a reference, incorporating all factors, was observed for an
NO<sub>2</sub> sensor (multiple correlation coefficient <i>R</i><sup>2</sup><sub>adj-orig</sub> = 0.57, <i>R</i><sup>2</sup><sub>adj-final</sub> = 0.81); however, other sensors showed no
apparent improvement in agreement. A four-node sensor network was
successfully able to capture ozone (two nodes) and PM (four nodes) data for an 8-month period of time and show expected diurnal concentration patterns, as
well as potential ozone titration due to nearby traffic emissions. Overall,
this study demonstrates the performance of emerging air quality sensor
technologies in a real-world setting; the variable agreement between sensors
and reference monitors indicates that in situ testing of sensors against
benchmark monitors should be a critical aspect of all field studies. |
| first_indexed | 2024-12-23T20:59:49Z |
| format | Article |
| id | doaj.art-46dde6bb76fb4b7ba2e932b2501a048f |
| institution | Directory Open Access Journal |
| issn | 1867-1381 1867-8548 |
| language | English |
| last_indexed | 2024-12-23T20:59:49Z |
| publishDate | 2016-11-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Measurement Techniques |
| spelling | doaj.art-46dde6bb76fb4b7ba2e932b2501a048f2022-12-21T17:31:24ZengCopernicus PublicationsAtmospheric Measurement Techniques1867-13811867-85482016-11-0195281529210.5194/amt-9-5281-2016Community Air Sensor Network (CAIRSENSE) project: evaluation of low-cost sensor performance in a suburban environment in the southeastern United StatesW. Jiao0G. Hagler1R. Williams2R. Sharpe3R. Brown4D. Garver5R. Judge6M. Caudill7J. Rickard8M. Davis9L. Weinstock10S. Zimmer-Dauphinee11K. Buckley12US Environmental Protection Agency (EPA), Office of Research and Development, Research Triangle Park, NC 27711, USAUS Environmental Protection Agency (EPA), Office of Research and Development, Research Triangle Park, NC 27711, USAUS Environmental Protection Agency (EPA), Office of Research and Development, Research Triangle Park, NC 27711, USAARCADIS US, Inc., Durham, NC 27713, USAUS EPA, Region 4, Atlanta, GA 30303, USAUS EPA, Region 4, Atlanta, GA 30303, USAUS EPA, Region 1, Boston, MA 02109, USAUS EPA, Region 5, Chicago, IL 60604, USAUS EPA, Region 8, Denver, CO 80202, USAUS EPA, Region 7, Lenexa, KS 66219, USAUS EPA, Office of Air Quality Planning and Standards, Research Triangle Park, NC 27711, USAGeorgia Environmental Protection Division, Atlanta, GA 30354, USAGeorgia Environmental Protection Division, Atlanta, GA 30354, USAAdvances in air pollution sensor technology have enabled the development of small and low-cost systems to measure outdoor air pollution. The deployment of a large number of sensors across a small geographic area would have potential benefits to supplement traditional monitoring networks with additional geographic and temporal measurement resolution, if the data quality were sufficient. To understand the capability of emerging air sensor technology, the Community Air Sensor Network (CAIRSENSE) project deployed low-cost, continuous, and commercially available air pollution sensors at a regulatory air monitoring site and as a local sensor network over a surrounding ∼ 2 km area in the southeastern United States. Collocation of sensors measuring oxides of nitrogen, ozone, carbon monoxide, sulfur dioxide, and particles revealed highly variable performance, both in terms of comparison to a reference monitor as well as the degree to which multiple identical sensors produced the same signal. Multiple ozone, nitrogen dioxide, and carbon monoxide sensors revealed low to very high correlation with a reference monitor, with Pearson sample correlation coefficient (r) ranging from 0.39 to 0.97, −0.25 to 0.76, and −0.40 to 0.82, respectively. The only sulfur dioxide sensor tested revealed no correlation (<i>r</i> < 0.5) with a reference monitor and erroneously high concentration values. A wide variety of particulate matter (PM) sensors were tested with variable results – some sensors had very high agreement (e.g., <i>r</i> = 0.99) between identical sensors but moderate agreement with a reference PM<sub>2.5</sub> monitor (e.g., <i>r</i> = 0.65). For select sensors that had moderate to strong correlation with reference monitors (<i>r</i> > 0.5), step-wise multiple linear regression was performed to determine if ambient temperature, relative humidity (RH), or age of the sensor in number of sampling days could be used in a correction algorithm to improve the agreement. Maximum improvement in agreement with a reference, incorporating all factors, was observed for an NO<sub>2</sub> sensor (multiple correlation coefficient <i>R</i><sup>2</sup><sub>adj-orig</sub> = 0.57, <i>R</i><sup>2</sup><sub>adj-final</sub> = 0.81); however, other sensors showed no apparent improvement in agreement. A four-node sensor network was successfully able to capture ozone (two nodes) and PM (four nodes) data for an 8-month period of time and show expected diurnal concentration patterns, as well as potential ozone titration due to nearby traffic emissions. Overall, this study demonstrates the performance of emerging air quality sensor technologies in a real-world setting; the variable agreement between sensors and reference monitors indicates that in situ testing of sensors against benchmark monitors should be a critical aspect of all field studies.https://www.atmos-meas-tech.net/9/5281/2016/amt-9-5281-2016.pdf |
| spellingShingle | W. Jiao G. Hagler R. Williams R. Sharpe R. Brown D. Garver R. Judge M. Caudill J. Rickard M. Davis L. Weinstock S. Zimmer-Dauphinee K. Buckley Community Air Sensor Network (CAIRSENSE) project: evaluation of low-cost sensor performance in a suburban environment in the southeastern United States Atmospheric Measurement Techniques |
| title | Community Air Sensor Network (CAIRSENSE) project: evaluation of low-cost
sensor performance in a suburban environment in the southeastern United
States |
| title_full | Community Air Sensor Network (CAIRSENSE) project: evaluation of low-cost
sensor performance in a suburban environment in the southeastern United
States |
| title_fullStr | Community Air Sensor Network (CAIRSENSE) project: evaluation of low-cost
sensor performance in a suburban environment in the southeastern United
States |
| title_full_unstemmed | Community Air Sensor Network (CAIRSENSE) project: evaluation of low-cost
sensor performance in a suburban environment in the southeastern United
States |
| title_short | Community Air Sensor Network (CAIRSENSE) project: evaluation of low-cost
sensor performance in a suburban environment in the southeastern United
States |
| title_sort | community air sensor network cairsense project evaluation of low cost sensor performance in a suburban environment in the southeastern united states |
| url | https://www.atmos-meas-tech.net/9/5281/2016/amt-9-5281-2016.pdf |
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