High Density Ozone Monitoring Using Gas Sensitive Semi-Conductor Sensors in the Lower Fraser Valley, British Columbia

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dc.contributor.author Bart, M en
dc.contributor.author Williams, David en
dc.contributor.author Ainslie, B en
dc.contributor.author McKendry, I en
dc.contributor.author Salmond, Jennifer en
dc.contributor.author Grange, Stuart en
dc.contributor.author Alavi-Shoshtari, M en
dc.contributor.author Steyn, D en
dc.contributor.author Henshaw, GS en
dc.date.accessioned 2014-05-01T04:57:34Z en
dc.date.issued 2014-02-28 en
dc.identifier.citation Environmental Science & Technology 48(7):3970-3977 28 Feb 2014 en
dc.identifier.issn 0013-936X en
dc.identifier.uri http://hdl.handle.net/2292/22045 en
dc.description.abstract A cost-efficient technology for accurate surface ozone monitoring using gas-sensitive semiconducting oxide (GSS) technology, solar power, and automated cell-phone communications was deployed and validated in a 50 sensor test-bed in the Lower Fraser Valley of British Columbia, over 3 months from May–September 2012. Before field deployment, the entire set of instruments was colocated with reference instruments for at least 48 h, comparing hourly averaged data. The standard error of estimate over a typical range 0–50 ppb for the set was 3 ± 2 ppb. Long-term accuracy was assessed over several months by colocation of a subset of ten instruments each at a different reference site. The differences (GSS-reference) of hourly average ozone concentration were normally distributed with mean −1 ppb and standard deviation 6 ppb (6000 measurement pairs). Instrument failures in the field were detected using network correlations and consistency checks on the raw sensor resistance data. Comparisons with modeled spatial O3 fields demonstrate the enhanced monitoring capability of a network that was a hybrid of low-cost and reference instruments, in which GSS sensors are used both to increase station density within a network as well as to extend monitoring into remote areas. This ambitious deployment exposed a number of challenges and lessons, including the logistical effort required to deploy and maintain sites over a summer period, and deficiencies in cell phone communications and battery life. Instrument failures at remote sites suggested that redundancy should be built into the network (especially at critical sites) as well as the possible addition of a “sleep-mode” for GSS monitors. At the network design phase, a more objective approach to optimize interstation distances, and the “information” content of the network is recommended. This study has demonstrated the utility and affordability of the GSS technology for a variety of applications, and the effectiveness of this technology as a means substantially and economically to extend the coverage of an air quality monitoring network. Low-cost, neighborhood-scale networks that produce reliable data can be envisaged. en
dc.publisher American Chemical Society en
dc.relation.ispartofseries Environmental Science & Technology en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. Details obtained from http://www.sherpa.ac.uk/romeo/issn/0013-936X/ en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.title High Density Ozone Monitoring Using Gas Sensitive Semi-Conductor Sensors in the Lower Fraser Valley, British Columbia en
dc.type Journal Article en
dc.identifier.doi 10.1021/es404610t en
pubs.issue 7 en
pubs.begin-page 3970 en
pubs.volume 48 en
dc.identifier.pmid 24579930 en
pubs.author-url http://pubs.acs.org/doi/abs/10.1021/es404610t en
pubs.end-page 3977 en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Article en
pubs.elements-id 430394 en
pubs.org-id Science en
pubs.org-id Chemistry en
pubs.org-id School of Environment en
dc.identifier.eissn 1520-5851 en
pubs.record-created-at-source-date 2014-03-14 en
pubs.dimensions-id 24579930 en

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