Plume characterization of a typical South African braai

Venter, Andrew D.; Jaars, Kerneels; Booyens, Wanda; Beukes, J. P.; Zyl, P. G. van; Josipovic, Miroslav; Hendriks, Johan; Vakkari, Ville; Hellén, Heidi; Hakola, Hannele; Aaltonen, Hermanni; Ruiz‐Jiménez, José; Riekkola, Marja Liisa; Laakso, Lauri

doi:10.17159/0379-4350/2015/v68a25

Cited by 4 publications

(4 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Bimodal diurnal trends are seen for CO, PM 10 and NO x . Bimodal peaks are typically associated with domestic activity since the peak times coincide with traffic, cooking, etc (Malaza 2017, Clerbaux et al 2008, Venter et al 2015. The H 2 S trend indicates an inverse relation between day and night and is typical the results of prevailing meteorological conditions.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Ambient air quality data reported at Sasol Secunda monitoring stations during COVID-19 lockdown – Mpumalanga, South Africa

Venter

Vos²

2021

Clean Air J.

View full text Add to dashboard Cite

Various local and international research has been published on the effects of COVID-19 lockdown on ambient air quality. In most cases, a reduction in ambient NOx and PM concentrations have been observed with varying changes in ambient SO2 levels. Secunda, located in the Highveld Priority Area in Mpumalanga, South Africa is known for its large industrial facilities utilising coal as primary feedstock. The towns of Secunda and eMbalenhle provide the majority of the workforce to Sasol and has therefore been the focus of this study. The ambient air quality in the Secunda region was assessed due to the changes in human behaviour during lockdown, familiarity with the Sasol facility and the strategic locations of ambient air quality stations.Results show a clear decrease in ambient CO, NO2 and PM concentrations, especially during the first two weeks of lockdown. Only subtle changes were observed for ambient H2S and SO2 pollutant concentrations at the ambient monitoring stations. An increasing trend in all ambient species was observed towards the end and post lockdown, in contrast to declining ambient temperatures with the onset of winter. This is also contrary to the reduction in emissions from the factory that conducted annual maintenance in the month following lockdown (phase shutdown). This article concludes that human behaviour has a material local ambient impact on CO, NO2 and PM pollutant species, while H2S concentration profiles are more directly related to the industrial complex’s levels of activity. Ambient SO2 trends did not show a similar correlation with the facility’s activities (as H2S), but a stronger correlation was observed with the diverse local and regional sources in close proximity to Secunda and eMbalenhle. The influence of better dispersion especially on a local scale, brought about by more effective emission heights, is considered material. Moreover, meteorological factors, on local air quality, has been shown to be a material contributor to observed ambient air quality levels in the study domain

show abstract

Section: Resultsmentioning

confidence: 99%

“…Carbon monoxide (CO) is a typical marker pollutant of combustion (Clerbaux et al 2008, Venter et al 2015. In the natural environment, veld fires will also produce CO amongst other components.…”

Section: Carbon Monoxide (Co)mentioning

confidence: 99%

Ambient air quality data reported at Sasol Secunda monitoring stations during COVID-19 lockdown – Mpumalanga, South Africa

Venter

Vos²

2021

Clean Air J.

View full text Add to dashboard Cite

show abstract

“…The meteorological data applied in this model was obtained from the Global Data Assimilation System (GDAS) archive of the National Centre for Environmental Prediction (NCEP) of the United States National Weather Service (USNWS). An arrival height of 100 m was chosen in order to reduce error margins associated with lower arrival heights (Venter et al, 2015). Overlay back trajectory frequency maps were compiled with programmable software.…”

Section: Meteorological Data Fire Frequencies and Back Trajectory Anmentioning

confidence: 99%

Twenty-one years of passive sampling monitoring of SO2, NO2 and O3 at the Cape Point GAW station, South Africa

Swartz

Zyl

Beukes

et al. 2020

Atmospheric Environment

Self Cite

View full text Add to dashboard Cite

“…Aerosol mass spectrometry measurements (AMS) conducted by Tiitta et al (2014) at Welgegund also indicated higher levels of oxygenated compounds. Furthermore, GCxGC-TOFMS analysis of aerosols collected from fresh plumes at Welgegund by Venter et al (2014) indicated the higher occurrence of primary emitted hydrocarbon compounds, compared to oxygenated organic compounds. Ruiz-Jimenez et al (2011b) determined the organic chemical composition of ultrafine (30 and 50 nm) and total suspended atmospheric particulates collected in the centre of a boreal forest in Finland.…”

Section: Characterisation and Semi-quantification Of Organic Compoundsmentioning

confidence: 99%

Size-resolved characterisation of organic compounds in atmospheric aerosols collected at Welgegund, South Africa

et al. 2015

View full text Add to dashboard Cite

The organic fraction of atmospheric aerosols is 20 to 90 % of which only a small percentage has been chemically characterised. Two-dimensional gas chromatography with a time-of-flight mass spectrometer (GCxGC-TOFMS) is a powerful instrument used to chemically characterise organic compounds. Size-resolved characterisation and semi-quantification of ambient organic aerosol compounds were performed with a GCxGC-TOFMS for the first time in South Africa. Twenty-four-hour samples were collected for 1 year for three different size ranges. A combined total of 1056 different organic compounds could be tentatively characterised. The largest number of organic compounds tentatively identified was PM 2.5-1 (particles in the size range 1-2.5 μm), while this size fraction also had the highest total number of normalised response factors (∑NRF). On average, 52, 26, 6, 13 and 3 % of species tentatively identified were oxygenated species, hydrocarbons, halogenated compounds, Ncontaining compounds and S-containing compounds, respectively. Oxygenated compounds were the most abundant species. Alkane and mono-aromatic species were the largest number of hydrocarbons tentatively identified with the highest ∑NRFs. The largest number of oxygenated species tentatively characterised were carboxylic acids and esters, while ether compounds had the highest ∑NRFs. Most of the halogenated compounds tentatively identified were chlorinated species with the highest ∑NRFs in two size fractions. Iodate species had a significantly higher ∑NRF in the PM 2.5-1 size fraction. The largest number of N-containing J Atmos Chem species tentatively characterised with the highest ∑NRFs were amines. A small number of Scontaining compounds with low ∑NRFs were tentatively identified. The major sources of organic compounds measured at Welgegund were considered to be biomass burning and air masses moving over the anthropogenically impacted source regions.

show abstract

Plume characterization of a typical South African braai

Cited by 4 publications

References 25 publications

Ambient air quality data reported at Sasol Secunda monitoring stations during COVID-19 lockdown – Mpumalanga, South Africa

Ambient air quality data reported at Sasol Secunda monitoring stations during COVID-19 lockdown – Mpumalanga, South Africa

Twenty-one years of passive sampling monitoring of SO2, NO2 and O3 at the Cape Point GAW station, South Africa

Size-resolved characterisation of organic compounds in atmospheric aerosols collected at Welgegund, South Africa

Contact Info

Product

Resources

About