Naslov
Comparison of electro-chemical sensors for air quality monitoring with reference methods In Zagreb

Autori
Davila, Silvije ; Bešlić, Ivan ; Marić, Marko ; Hrga, Ivana

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings 18th World Clean Air Congress 2019 / Kara, Melik ; Dumanoglu, Yetkin ; Tuna Tuygun, Gizem ; Bayram, Abdurrahman ; Elbir, Tolga - Istanbul : Turkish National Committee for Air Pollution Research and Control (TUNCAP), 2019, 112-122

ISBN
978-975-00331-2-4

Skup
18th World Clean Air Congress (WCAC 2019)

Mjesto i datum
Istanbul, Turska, 23.09.2019. - 27.09.2019

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Low-cost air sensors ; Grubb test ; AQMeshPod

Sažetak
Within the project "Eco Map of Zagreb", 8 sensor sets (type AQMeshPod) were obtained for air quality measurement. Throughout 2018, a set of sensors was set up at an automatic measuring station at the Institute for Medical Research and Occupational Health (IMROH) for comparison with reference methods for air quality measurement. This automatic station is a city background station within the Zagreb network for air quality monitoring, where measurements of SO2, CO, NO2, O3, PM10 and PM2.5 are performed using standardized methods accredited to EN ISO / IEC 17025. The paper presents a comparison of mass concentrations of pollutants SO2, CO, NO2, O3, PM10 and PM2.5 determined by sensors and reference methods during 2018. For the gases, the hourly averages were compared and for the particle matter, 24- hour averages of concentrations. The raw data of the sensor and validated data of the reference devices were used. Negative data values from the sensor were replaced by the minimum detection limits of the reference methods. Data were compared using Student's t-test dependent samples and regression analysis. A Grubb test was performed to remove the outliers of data pairs from the database. The Grubb test is not applicable for gaseous pollutants due to high dispersion of results. For PM10 and PM2.5, the Grubb test is satisfactorily applied with a critical factor of 5% confidence level. In order to remove large deviations between the results obtained by sensors and by the reference methods for gaseous pollutants and in order to reduce the scattering of the results, data filtering was performed. The results where the deviation between sensors data and reference methods data over 90% were excluded in the filtering process. The Grubb test was performed over the new set of data. A comparison of sensor results with the results of reference methods showed a large scattering of all gaseous pollutants while the comparison for PM10 and PM2.5 indicated a satisfactory low dispersion. The results of regression analysis showed a significant seasonal dependence for all pollutants. There was a significant statistical difference between the reference method and sensors for the whole year and in all seasons for all gas pollutants as well as for PM10. For PM2.5 there was not a significant statistical difference for the whole year as well as in summer, while for other periods there was a statistically significant difference.

Izvorni jezik
Engleski

Znanstvena područja
Javno zdravstvo i zdravstvena zaštita

POVEZANOST RADA