|
|
PM2.5 concentration field in the air of Zadni Treban village during heating season
Wallenfelsová, Karolína ; Hovorka, Jan (advisor) ; Mareš, Petr (referee)
This bachelor thesis evaluates the impact of local heating on PM2,5 concentrations mo- nitored in a village Zadní Třebaň in Central Bohemia between 21. 12. 2021 and 3. 2. 2022. It also examines the effect wind speed and temperature have on the PM2,5 concentrations. The PM2,5 concentrations were measured using both stationary and mobile monitoring. For the stationary monitoring, 7 DustTrak 8520 monitors (integration time 1 min) were used. A network of these monitors was built to cover different settlement (village edge, village center) as well as geological types of locations (valley, hill). The mobile monitoring took place 31. 1. 2022 over the course of 7 walks during which PM2,5 and PNC concentration were measured. Portable monitors were used for mobile mea- surements - DustTrak DRX for measuring PM2,5 concentrations and P-Trak for measuring particle number concentrations (PNC). The integration time for both of these monitors was 1 s. The aim of the mobile monitoring was to supplement knowledge gained from the stationary monitoring. The highest average 24h PM2,5 concentrations were measured on the 22. and 23. 12. 2021. On the 22nd the US EPA limit of 35 µg · m−3 was exceeded on almost all measuring sites except Stations 4 and 7. On the 23rd the limit was exceeded on all measuring sites except...
|
|
|
PM2.5 field in the air of Družec village during heating season
Šmok, Dominik ; Hovorka, Jan (advisor) ; Kozáková, Jana (referee)
Residential heating by solid fuel combustion in small settlements has great potential to degrade air quality, especially PM2.5 emissions, during the winter heating season, to such an extent, that WHO and US-EPA limits for PM2.5 are frequently exceeded. There were found significant temporal variability and spatial heterogeneity of the PM2.5 concentration field. 24h limit for PM2.5 (US-EPA, 35 μg∙m-3) using a stationary network of 6 monitors measuring minute concentration of PM2.5, In the village Družec, Kladno district, during the 14-day measuring campaign. Campaign average exceeded the limit at the primary school garden. In the other sites, the limit was usually exceeded occasionally except one day, when the limit exceedance was recorded in all the sites as well at the whole area of the Czech Republic. The analysis of time course of minute values of PM2.5 shows that the residential heating increased PM2.5 concentrations on average by 61-72% (16-25 g∙m-3) or 40-49% (6-10 g∙m-3) at exposed or background sites respectively; PM2.5 values decreased exponentially with wind speed up to 2 m∙s-1, when they stabilized at 8-16 g∙m-3. At the microscale of the village, there were also found spatial and temporal heterogeneity of PM2.5 and aerosol particle concentrations PNC using by mobile measurement of PNC...
|
guest ::
