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Erik Ahlberg
Institute of Physics, Lund University, 22100 Lund, Sweden

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Journal article
Published: 14 December 2020 in Atmosphere
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Air pollution is recognized as the most important environmental factor that adversely affects human and societal wellbeing. Due to rapid urbanization, air pollution levels are increasing in the Sub-Saharan region, but there is a shortage of air pollution monitoring. Hence, exposure data to use as a base for exposure modelling and health effect assessments is also lacking. In this study, low-cost sensors were used to assess PM2.5 (particulate matter) levels in the city of Adama, Ethiopia. The measurements were conducted during two separate 1-week periods. The measurements were used to develop a land-use regression (LUR) model. The developed LUR model explained 33.4% of the variance in the concentrations of PM2.5. Two predictor variables were included in the final model, of which both were related to emissions from traffic sources. Some concern regarding influential observations remained in the final model. Long-term PM2.5 and wind direction data were obtained from the city’s meteorological station, which should be used to validate the representativeness of our sensor measurements. The PM2.5 long-term data were however not reliable. Means of obtaining good reference data combined with longer sensor measurements would be a good way forward to develop a stronger LUR model which, together with improved knowledge, can be applied towards improving the quality of health. A health impact assessment, based on the mean level of PM2.5 (23 µg/m3), presented the attributable burden of disease and showed the importance of addressing causes of these high ambient levels in the area.

ACS Style

Asmamaw Abera; Kristoffer Mattisson; Axel Eriksson; Erik Ahlberg; Geremew Sahilu; Bezatu Mengistie; Abebe Genetu Bayih; Abraham Aseffaa; Ebba Malmqvist; Christina Isaxon. Air Pollution Measurements and Land-Use Regression in Urban Sub-Saharan Africa Using Low-Cost Sensors—Possibilities and Pitfalls. Atmosphere 2020, 11, 1357 .

AMA Style

Asmamaw Abera, Kristoffer Mattisson, Axel Eriksson, Erik Ahlberg, Geremew Sahilu, Bezatu Mengistie, Abebe Genetu Bayih, Abraham Aseffaa, Ebba Malmqvist, Christina Isaxon. Air Pollution Measurements and Land-Use Regression in Urban Sub-Saharan Africa Using Low-Cost Sensors—Possibilities and Pitfalls. Atmosphere. 2020; 11 (12):1357.

Chicago/Turabian Style

Asmamaw Abera; Kristoffer Mattisson; Axel Eriksson; Erik Ahlberg; Geremew Sahilu; Bezatu Mengistie; Abebe Genetu Bayih; Abraham Aseffaa; Ebba Malmqvist; Christina Isaxon. 2020. "Air Pollution Measurements and Land-Use Regression in Urban Sub-Saharan Africa Using Low-Cost Sensors—Possibilities and Pitfalls." Atmosphere 11, no. 12: 1357.

Journal article
Published: 06 March 2020 in Atmosphere
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Concentrations of aerosol particles in Poland and their sources are rarely discussed in peer-reviewed journal articles despite serious air quality issues. A source apportionment of carbonaceous aerosol particles was performed during winter at a rural background environment field site in north-eastern Poland. Data were used of light absorption at seven wavelengths and levoglucosan concentrations along existing monitoring of PM2.5, organic carbon and elemental carbon (OC/EC) at the Diabła Góra EMEP monitoring site between January 17 and March 19 during the EMEP intensive winter campaign of 2018. Average PM2.5, OC, EC, equivalent black carbon (eBC) and levoglucosan concentrations and standard deviations amounted to 18.5 ± 9.3, 4.5 ± 2.5, 0.57 ± 0.28, 1.04 ± 0.62 and 0.134 ± 0.084 µg m−3 respectively. Various tools for source apportionment were used to obtain a source contribution to carbonaceous matter (CM) with three components. The wood combustion source component contributed 1.63 µg m−3 (21%), domestic coal combustion 3.3 µg m−3 (41%) and road transport exhaust 2.9 µg m−3 (38%). Similar levels and temporal variability were found for the nearby Lithuanian site of Preila, corroborating the Polish results.

ACS Style

Adam Kristensson; Stina Ausmeel; Julija Pauraite; Axel Eriksson; Erik Ahlberg; Steigvilė Byčenkienė; Anna Degórska. Source Contributions to Rural Carbonaceous Winter Aerosol in North-Eastern Poland. Atmosphere 2020, 11, 263 .

AMA Style

Adam Kristensson, Stina Ausmeel, Julija Pauraite, Axel Eriksson, Erik Ahlberg, Steigvilė Byčenkienė, Anna Degórska. Source Contributions to Rural Carbonaceous Winter Aerosol in North-Eastern Poland. Atmosphere. 2020; 11 (3):263.

Chicago/Turabian Style

Adam Kristensson; Stina Ausmeel; Julija Pauraite; Axel Eriksson; Erik Ahlberg; Steigvilė Byčenkienė; Anna Degórska. 2020. "Source Contributions to Rural Carbonaceous Winter Aerosol in North-Eastern Poland." Atmosphere 11, no. 3: 263.

Journal article
Published: 17 July 2019 in Atmosphere
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A large portion of atmospheric aerosol particles consists of secondary material produced by oxidation reactions. The relative importance of secondary organic aerosol (SOA) can increase with improved emission regulations. A relatively simple way to study potential particle formation in the atmosphere is by using oxidation flow reactors (OFRs) which simulate atmospheric ageing. Here we report on the first ambient OFR ageing experiment in Europe, coupled with scanning mobility particle sizer (SMPS), aerosol mass spectrometer (AMS) and proton transfer reaction (PTR)-MS measurements. We found that the simulated ageing did not produce any measurable increases in particle mass or number concentrations during the two months of the campaign due to low concentrations of precursors. Losses in the reactor increased with hydroxyl radical (OH) exposure and with increasing difference between ambient and reactor temperatures, indicating fragmentation and evaporation of semivolatile material.

ACS Style

Erik Ahlberg; Stina Ausmeel; Axel Eriksson; Thomas Holst; Tomas Karlsson; William H. Brune; Göran Frank; Pontus Roldin; Adam Kristensson; Birgitta Svenningsson. No Particle Mass Enhancement from Induced Atmospheric Ageing at a Rural Site in Northern Europe. Atmosphere 2019, 10, 408 .

AMA Style

Erik Ahlberg, Stina Ausmeel, Axel Eriksson, Thomas Holst, Tomas Karlsson, William H. Brune, Göran Frank, Pontus Roldin, Adam Kristensson, Birgitta Svenningsson. No Particle Mass Enhancement from Induced Atmospheric Ageing at a Rural Site in Northern Europe. Atmosphere. 2019; 10 (7):408.

Chicago/Turabian Style

Erik Ahlberg; Stina Ausmeel; Axel Eriksson; Thomas Holst; Tomas Karlsson; William H. Brune; Göran Frank; Pontus Roldin; Adam Kristensson; Birgitta Svenningsson. 2019. "No Particle Mass Enhancement from Induced Atmospheric Ageing at a Rural Site in Northern Europe." Atmosphere 10, no. 7: 408.

Research article
Published: 01 March 2019 in Atmospheric Chemistry and Physics
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Atmospheric particulate water is ubiquitous, affecting particle transport and uptake of gases. Yet, research on the effect of water on secondary organic aerosol (SOA) mass yields is not consistent. In this study, the SOA mass yields of an α-pinene and m-xylene mixture, at a concentration of 60 µg m−3, were examined using an oxidation flow reactor operated at a relative humidity (RH) of 60 % and a residence time of 160 s. Wet or dried ammonium sulfate and ammonium nitrate seed particles were used. By varying the amount of seed particle surface area, the underestimation of SOA formation induced by the short residence time in flow reactors was confirmed. Starting at a SOA mass concentration of ∼5 µg m−3, the maximum yield increased by a factor of ∼2 with dry seed particles and on average a factor of 3.2 with wet seed particles. Hence, wet particles increased the SOA mass yield by ∼60 % compared to the dry experiment. Maximum yield in the reactor was achieved using a surface area concentration of ∼1600 µm2 cm−3. This corresponded to a condensational lifetime of 20 s for low-volatility organics. The O:C ratio of SOA on wet ammonium sulfate was significantly higher than when using ammonium nitrate or dry ammonium sulfate seed particles, probably due to differences in heterogeneous chemistry.

ACS Style

Erik Ahlberg; Axel Eriksson; William H. Brune; Pontus Roldin; Birgitta Svenningsson. Effect of salt seed particle surface area, composition and phase on secondary organic aerosol mass yields in oxidation flow reactors. Atmospheric Chemistry and Physics 2019, 19, 2701 -2712.

AMA Style

Erik Ahlberg, Axel Eriksson, William H. Brune, Pontus Roldin, Birgitta Svenningsson. Effect of salt seed particle surface area, composition and phase on secondary organic aerosol mass yields in oxidation flow reactors. Atmospheric Chemistry and Physics. 2019; 19 (4):2701-2712.

Chicago/Turabian Style

Erik Ahlberg; Axel Eriksson; William H. Brune; Pontus Roldin; Birgitta Svenningsson. 2019. "Effect of salt seed particle surface area, composition and phase on secondary organic aerosol mass yields in oxidation flow reactors." Atmospheric Chemistry and Physics 19, no. 4: 2701-2712.