Added Value of Vaisala AQT530 Sensors as a Part of a Sensor Network for Comprehensive Air Quality Monitoring

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Petäjä , T , Ovaska , A , Fung , P L , Poutanen , P , Yli-Ojanperä , J , Suikkola , J , Laakso , M , Mäkelä , T , Niemi , J V , Keskinen , J , Järvinen , A , Kuula , J , Kurppa , M , Hussein , T , Tarkoma , S , Kulmala , M , Karppinen , A , Manninen , H E & Timonen , H 2021 , ' Added Value of Vaisala AQT530 Sensors as a Part of a Sensor Network for Comprehensive Air Quality Monitoring ' , Frontiers in Environmental Science , vol. 9 , 719567 . https://doi.org/10.3389/fenvs.2021.719567

Title: Added Value of Vaisala AQT530 Sensors as a Part of a Sensor Network for Comprehensive Air Quality Monitoring
Author: Petäjä, Tuukka; Ovaska, Aino; Fung, Pak Lun; Poutanen, Pyry; Yli-Ojanperä, Jaakko; Suikkola, Jari; Laakso, Mikko; Mäkelä, Taneli; Niemi, Jarkko V.; Keskinen, Jorma; Järvinen, Anssi; Kuula, Joel; Kurppa, Mona; Hussein, Tareq; Tarkoma, Sasu; Kulmala, Markku; Karppinen, Ari; Manninen, Hanna E.; Timonen, Hilkka
Other contributor: University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Finnish Meteorological Institute
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Department of Computer Science
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Helsinki Region Environmental Services Authority (HSY)





Date: 2021-07-16
Language: eng
Number of pages: 18
Belongs to series: Frontiers in Environmental Science
ISSN: 2296-665X
DOI: https://doi.org/10.3389/fenvs.2021.719567
URI: http://hdl.handle.net/10138/333236
Abstract: Poor air quality influences the quality of life in the urban environment. The regulatory observation stations provide the backbone for the city administration to monitor urban air quality. Recently a suite of cost-effective air quality sensors has emerged to provide novel insights into the spatio-temporal variability of aerosol particles and trace gases. Particularly in low concentrations these sensors might suffer from issues related e.g., to high detection limits, concentration drifts and interdependency between the observed trace gases and environmental parameters. In this study we characterize the optical particle detector used in AQT530 (Vaisala Ltd.) air quality sensor in the laboratory. We perform a measurement campaign with a network of AQT530 sensors in Helsinki, Finland in 2020-2021 and present a long-term performance evaluation of five sensors for particulate (PM10, PM2.5) and gaseous (NO2, NO, CO, O-3) components during a half-year co-location study with reference instruments at an urban traffic site. Furthermore, short-term (3-5 weeks) co-location tests were performed for 25 sensors to provide sensor-specific correction equations for the fine-tuning of selected pollutants in the sensor network. We showcase the added value of the verified network of 25 sensor units to address the spatial variability of trace gases and aerosol mass concentrations in an urban environment. The analysis assesses road and harbor traffic monitoring, local construction dust monitoring, aerosol concentrations from fireworks, impact of sub-urban small scale wood combustion and detection of long-range transport episodes on a city scale. Our analysis illustrates that the calibrated network of Vaisala AQT530 air quality sensors provide new insights into the spatio-temporal variability of air pollution within the city. This information is beneficial to, for example, optimization of road dust and construction dust emission control as well as provides data to tackle air quality problems arising from traffic exhaust and localized wood combustion emissions in the residential areas.
Subject: air quality
air quality sensors
sensor network
particulate matter
gaseous pollutants
DEPOSITED SURFACE-AREA
LOW-COST
PARTICULATE MATTER
ELECTROCHEMICAL SENSORS
TERM EXPOSURE
BLACK CARBON
POLLUTION
EMISSIONS
HELSINKI
DUST
1172 Environmental sciences
113 Computer and information sciences
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