Relationship between the Optical Properties and Chemical Composition of Urban Aerosol Particles in Lithuania

Pauraitė, Julija; Plauškaitė, Kristina; Dudoitis, Vadimas; Ulevičius, Vidmantas

doi:10.1155/2018/8674173

Cited by 8 publications

(7 citation statements)

References 64 publications

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“…Outside the event days, eBC mass concentration from fossil fuels origin (eBCff) was dominating in both outdoor and indoor air (68% and 64%, respectively). These findings are consistent with our previous study of organic aerosol (OA) and eBC source apportionment in Vilnius outdoor air [38] which revealed that during the non-heating season, traffic-related OA contributed to the PM1 fraction by…”

Section: Particulate Matter (Pm) Levels In Indoor and Outdoor Airsupporting

confidence: 93%

Office Indoor PM and BC Level in Lithuania: The Role of a Long-Range Smoke Transport Event

et al. 2021

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While the impacts of climate change on wildfires and resulting air pollution levels have been observed, little is known about how indoor air filtering systems are performing under intensive smoke conditions. For this aim, particle number size distribution and concentration in a size range 0.5–18 µm and equivalent black carbon (eBC) mass concentration were measured in a modern office with a mechanical ventilation system. Measurements took place from 30 September to 6 October 2020 in the Center for Physical Sciences and Technology (FTMC) campus located in the urban background environment in Lithuania. During the measurement campaign, an intensive pollution episode, related to long-range transport wildfire smoke, was observed. The results indicated that the smoke event increased both indoor and outdoor eBC mass concentrations twice. Filters were non-selective for different eBC sources (biomass burning versus traffic) or chemical composition of carbonaceous aerosol particles (eBC versus brown carbon (BrC)). Air filtering efficiency was found to be highly dependent on particle size. During the smoke event the highest particle number concentration was observed at 2.1 µm and 1.0 µm size particles in outdoor and indoor air, respectively. Differences of indoor to outdoor ratio between event and non-event days were not significant. Because of lower removal rate for small particles, eBC had higher contribution to total PM2.5 mass concentration in indoor air than in outdoor air. The results gained are crucial for decision-making bodies in order to implement higher-quality air-filtering systems in office buildings and, as a result, minimize potential health impacts.

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Section: Particulate Matter (Pm) Levels In Indoor and Outdoor Airsupporting

confidence: 93%

Office Indoor PM and BC Level in Lithuania: The Role of a Long-Range Smoke Transport Event

et al. 2021

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“…6). The previous study of eBC in Vilnius during the warm season under normal conditions showed a dominant influence of eBC FF (92%) [49]. That finding suggested that the PM 1 chemical composition on 25-29 May 2019 was clearly unusual for Vilnius and was related with the OBB event.…”

Section: Apportionment Of Carbonaceous Aerosol Sourcesmentioning

confidence: 81%

“…Moreover, a poor correlation between f 60 and CM BB was observed in the indoor samples, likely due to the photochemical degradation of levoglucosan [50]. Recent studies [44,49] demonstrate that the mass spectral fingerprint of levoglucosan (f 60 ) cannot be used as BB tracer in aged BB emissions (>1 day). These findings suggest that the method of CM source apportionment based on optical properties is indeed a good BB indicator.…”

Section: Apportionment Of Carbonaceous Aerosol Sourcesmentioning

confidence: 99%

Effect of spring grass fires on indoor air quality in air-conditioned office building

Pauraitė¹,

Garbarienė²,

Minderytė³

et al. 2021

physics

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Open biomass burning (OBB) is a significant air pollution source, but it is still not clear to what extent OBB events affect indoor air quality [1]. Outdoor and indoor measurements of submicron particulate matter (PM1) were conducted on 25–29 April (2019) in the capital city Vilnius (Lithuania). Fires from neighbouring countries (Belarus, Ukraine and Russia) and in the vicinity of Vilnius broke out during the measurement campaign. The temporal evolution and transport of OBB plume were investigated by combining the air mass backward trajectory analysis and fire satellite observation (MODIS) database. Measurements of the PM1 chemical composition in real-time were performed using an aerosol chemical speciation monitor (ACSM) and an aethalometer. Organic matter was the clearly dominant component, accounting for >70%, in both indoor and outdoor PM1. The air filtering system of the office building removed approximately up to 55% of PM1. Despite a significantly lower PM1 pollution level in the office, highly acidic indoor PM1 could have harmful effects on the human health. Source apportionment of particulate carbonaceous matter revealed a significant importance of OBB-related particles (average 56%) to indoor air.

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“…The accumulation mode and Aitken mode particles increased explosively in the morning (05:00-09:00), while the particle size range became wider during the same time when local valley wind built up and lasted until the evening. Because the accumulation mode mainly contributes to the scattering coefficient (Pauraite et al, 2018), the scattering coefficients exhibited higher values during daytime than nighttime (Figure 4a). However, the mean particle size of SMPS experienced a rapid declined between 09:00 and 11:00 due to an increase in nucleation mode particles (Figure 5a; Figure S4 in Supporting Information S1).…”

Section: The Diurnal Cycle Of the Size Distribution Of Atmospheric Ae...mentioning

confidence: 99%

“…The impact of aerosols depends on their chemical composition and physical properties (Pauraite et al., 2018). The chemical compositions of atmospheric aerosols in the TP play a crucial role in evaluating the effects of air‐pollutant transport and radiative energy balance (Lau et al., 2006; Xu et al., 2020).…”

Section: Introductionmentioning

confidence: 99%

Physical Properties, Chemical Components, and Transport Mechanisms of Atmospheric Aerosols Over a Remote Area on the South Slope of the Tibetan Plateau

Yu,

Tian,

Kang

et al. 2024

JGR Atmospheres

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The physicochemical properties and origins of atmospheric aerosols in the Tibetan Plateau (TP) region are a research topic of great interest, but an in‐depth understanding of this topic is challenging, partially due to a lack of intensive in situ observations. Thus, a field campaign was conducted over Yadong, a remote area on the south slope of the TP from June 11 to 31 August 2021. The aerosol loading was low, with a black carbon mass concentration of 147.4 ± 98.4 ng·m−3. Aerosol single‐scattering albedo was low (0.73 ± 0.11 at 550 nm) and increased from 450 to 700 nm wavelength. Organic matter (OM) accounting for 69.6% of the total aerosol mass and relatively high secondary organic carbon ratios, highlighting the importance of secondary formation. An interesting phenomenon observed was that the evolution of aerosols was mainly characterized by diurnal variation, which could not be explained by large‐scale atmospheric processes such as Indian summer monsoon. Instead, it was found that regional mountain‐valley winds between the Himalayas and South Asia transported polluted air masses toward the TP, especially in the afternoon when regional valley wind are expected to be the strongest and the boundary layer in South Asia is deepest. Additionally, daytime local valley wind further elevated these aerosols to higher altitudes on the TP. This paper provides insights into the transport mechanisms of aerosols from South Asia to the TP. These findings are of great importance since aerosols exhibit significant diurnal variations in the TP region.

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Relationship between the Optical Properties and Chemical Composition of Urban Aerosol Particles in Lithuania

Cited by 8 publications

References 64 publications

Office Indoor PM and BC Level in Lithuania: The Role of a Long-Range Smoke Transport Event

Office Indoor PM and BC Level in Lithuania: The Role of a Long-Range Smoke Transport Event

Effect of spring grass fires on indoor air quality in air-conditioned office building

Physical Properties, Chemical Components, and Transport Mechanisms of Atmospheric Aerosols Over a Remote Area on the South Slope of the Tibetan Plateau

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