Emission of volatile organic compounds from residential biomass burning and their rapid chemical transformations

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 903, P. 166592 - 166592

Published: Aug. 26, 2023

Biomass combustion releases a complex array of Volatile Organic Compounds (VOCs) that pose significant challenges to air quality and human health. Although biomass burning has been extensively studied at ecosystem levels, understanding the atmospheric transformation impact on emissions in urban environments remains challenging due sources materials. In this study, we investigate VOC emission rates chemical processing predominantly wood small centre Greece. Ioannina is situated valley within Dinaric Alps experiences intense pollution accumulation during winter its topography high activity. During event days, ambient mixing ratios key species were found be similar those reported for major centres worldwide. Positive matrix factorisation (PMF) analysis revealed was dominant source (>50 %), representing two thirds OH reactivity, which indicates highly reactive mixture. Calculated reactivity ranges from 5 s-1 an unprecedented 278 s-1, averages 93 ± 66 9 PM, indicating presence exceptionally VOCs. The pronounced photochemical formation organic acids coincided with ozone, highlighting significance secondary pollutants poorly ventilated areas. Our findings underscore pressing need transition environmentally friendly energy areas, order improve safeguard public

Language: Английский

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The important contribution of secondary formation and biomass burning to oxidized organic nitrogen (OON) in a polluted urban area: insights from in situ measurements of a chemical ionization mass spectrometer (CIMS)

Atmospheric chemistry and physics, Journal Year: 2023, Volume and Issue: 23(15), P. 8855 - 8877

Published: Aug. 9, 2023

Abstract. To investigate the sources and formation mechanism of oxidized organic nitrogen (OON), field measurements OON were conducted using an iodide-adduct chemical ionization mass spectrometer equipped with a Filter Inlet for Gases AEROsols (FIGAERO-CIMS) during fall 2018 in megacity Guangzhou, China. Using levoglucosan as tracer biomass burning emissions, results show that (49±23 %) secondary (51±23 accounted comparable fractions to total particle-phase (pOON) but 24±25 % 76±25 gas-phase (gOON), respectively, signifying important contribution pOON gOON this urban area. Calculations production rates indicated hydroxyl radical (42 nitrate (NO3) (49 oxidation pathways potentially dominated gOON. A high concentration NO3 radicals afternoon was observed, demonstrating daytime might be more than previous recognition. Monoterpenes, found major precursors gOON, mainly from anthropogenic emissions The ratio Ox ([Ox] = [O3] + [NO2]) increased function relative humidity aerosol surface area, indicating heterogeneous reaction pathway pOON. Finally, highly 6 11 oxygen atoms highlighting complex processes ambient air. Overall, our improve understanding dynamic variation atmosphere.

Language: Английский

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Assessing the role of atmospheric dispersion vs. emission strength in the southern Po Valley (Italy) using dispersion-normalised multi-time receptor modelling

Atmospheric Environment, Journal Year: 2023, Volume and Issue: 316, P. 120168 - 120168

Published: Oct. 30, 2023

In this paper, we applied the Dispersion Normalised Positive Matrix Factorisation (DN-PMF) approach recently proposed in literature to provide a more realistic picture of relative importance emission strength vs. atmospheric dispersion conditions. The disentanglement such effects is great concern pollution hot spots like Po Valley (Italy), where particulate matter limit values are exceeded despite existing abatement measures. To explore potentiality DN-PMF – still scarcely well-chemically characterised PM1 (atmospheric particles with aerodynamic diameter <1 μm) dataset comprising samples collected at different time resolutions an urban background site (Bologna) southern was used. Indeed, it well known that shallow mixing layers promote pollutant accumulation but observation not enough exclude enhancement which could be tackled by appropriate strategies. source apportionment sub-micron sized aerosols having quite long residence complex environment - also strongly impacted secondary aerosol formation on basin-scale generally challenging when using receptor models. Due availability huge variables multiple resolutions, work implemented multi-time resolution (MT) achieve better identification and gain knowledge about dilution emissions. A comparison between results obtained application regular multi (REG-MT) DN-MT presented here for five factors identified (nitrate-dominated, sulphate-dominated, biomass burning, mineral dust, aerosol). first interesting outcome REG-MT do point significant differences temporal patterns components sources impacting (i.e. sulphate- nitrate-dominated aerosol, burning) thus suggesting diel modulation these emissions somehow masked stronger variability layer. Conversely, contributions from local pronounced variation traffic reproduced ambient concentrations enhanced compared REG-MT. This important piece information highlighting have been likely underestimated assessments. our knowledge, one very few applications European effort made implement air containment measures much effective reducing PM levels; moreover, paper detailed discussion possible interpretation output terms reported.

Language: Английский

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Toxicological Effects of Secondary Air Pollutants

Chemical Research in Chinese Universities, Journal Year: 2023, Volume and Issue: 39(3), P. 326 - 341

Published: April 29, 2023

Language: Английский

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Brown carbon absorption in the Mediterranean basin from local and long-range transported biomass burning air masses

Atmospheric Environment, Journal Year: 2023, Volume and Issue: 306, P. 119822 - 119822

Published: May 6, 2023

Language: Английский

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