Comparison of measurements of black carbon concentrations in aerosol, using two aethalometry methods

2021 ◽  
Author(s):  
Yury Turchinovich ◽  
Vladimir Kopeikin ◽  
Alexander Novigatsky ◽  
Viktor Pol’kin ◽  
Sergey Sakerin ◽  
...  
Keyword(s):  
Black Carbon ◽  
Carbon Concentrations

scholarly journals Traffic Density-Related Black Carbon Distribution: Impact of Wind in a Basin Town

2021 ◽  
Vol 18 (12) ◽  
pp. 6490
Author(s):  
Borut Jereb ◽  
Brigita Gajšek ◽  
Gregor Šipek ◽  
Špela Kovše ◽  
Matevz Obrecht
Keyword(s):  
Black Carbon ◽  
Carbon Concentration ◽  
Ground Level ◽  
Traffic Density ◽  
Carbon Distribution ◽  
Wind Speeds ◽  
Black Carbon Concentration ◽  
Low Wind Speeds ◽  
Temperature Inversions ◽  
Carbon Concentrations

Black carbon is one of the riskiest particle matter pollutants that is harmful to human health. Although it has been increasingly investigated, factors that depend on black carbon distribution and concentration are still insufficiently researched. Variables, such as traffic density, wind speeds, and ground levels can lead to substantial variations of black carbon concentrations and potential exposure, which is even riskier for people living in less-airy sites. Therefore, this paper “fills the gaps” by studying black carbon distribution variations, concentrations, and oscillations, with special emphasis on traffic density and road segments, at multiple locations, in a small city located in a basin, with frequent temperature inversions and infrequent low wind speeds. As wind speed has a significant impact on black carbon concentration trends, it is critical to present how low wind speeds influence black carbon dispersion in a basin city, and how black carbon is dependent on traffic density. Our results revealed that when the wind reached speeds of 1 ms−1, black carbon concentrations actually increased. In lengthy wind periods, when wind speeds reached 2 or 3 ms−1, black carbon concentrations decreased during rush hour and in the time of severe winter biomass burning. By observing the results, it could be concluded that black carbon persists longer in higher altitudes than near ground level. Black carbon concentration oscillations were also seen as more pronounced on main roads with higher traffic density. The more the traffic decreases and becomes steady, the more black carbon concentrations oscillate.

scholarly journals Effect of Reducing Ambient Traffic-Related Air Pollution on Blood Pressure

Hypertension ◽  
2021 ◽  
Vol 77 (3) ◽  
pp. 823-832
Author(s):  
Neelakshi Hudda ◽  
Misha Eliasziw ◽  
Scott O. Hersey ◽  
Ellin Reisner ◽  
Robert D. Brook ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Air Pollution ◽  
Black Carbon ◽  
Mixed Model ◽  
Particle Number ◽  
Linear Mixed Model ◽  
High Efficiency ◽  
High Exposure ◽  
Carbon Concentrations

Exposure to traffic-related air pollution (TRAP) may contribute to increased prevalence of hypertension and elevated blood pressure (BP) for residents of near-highway neighborhoods. Relatively few studies have investigated the effects of reducing TRAP exposure on short-term changes in BP. We assessed whether reducing indoor TRAP concentrations by using stand-alone high-efficiency particulate arrestance (HEPA) filters and limiting infiltration through doors and windows effectively prevented acute (ie, over a span of hours) increases in BP. Using a 3-period crossover design, 77 participants were randomized to attend three 2-hour-long exposure sessions separated by 1-week washout periods. Each participant was exposed to high, medium, and low TRAP concentrations in a room near an interstate highway. Particle number concentrations, black carbon concentrations, and temperature were monitored continuously. Systolic BP (SBP), diastolic BP, and heart rate were measured every 10 minutes. Outcomes were analyzed with a linear mixed model. The primary outcome was the change in SBP from 20 minutes from the start of exposure. SBP increased with exposure duration, and the amount of increase was related to the magnitude of exposure. The mean change in SBP was 0.6 mm Hg for low exposure (mean particle number and black carbon concentrations, 2500 particles/cm 3 and 149 ng/m 3 ), 1.3 mm Hg for medium exposure (mean particle number and black carbon concentrations, 11 000 particles/cm 3 and 409 ng/m 3 ), and 2.8 mm Hg for high exposure (mean particle number and black carbon concentrations, 30 000 particles/cm 3 and 826 ng/m 3 ; linear trend P =0.019). There were no statistically significant differences in the secondary outcomes, diastolic BP, or heart rate. In conclusion, reducing indoor concentrations of TRAP was effective in preventing acute increases in SBP.

Inferring Black Carbon Concentrations in Particulate Organic Matter by Observing Pyrene Fluorescence Losses

2009 ◽  
Vol 43 (13) ◽  
pp. 4864-4870 ◽  
Author(s):  
D. Xanat Flores-Cervantes ◽  
Christopher M. Reddy ◽  
Philip M. Gschwend
Keyword(s):  
Organic Matter ◽  
Black Carbon ◽  
Particulate Organic Matter ◽  
Pyrene Fluorescence ◽  
Carbon Concentrations

High airborne black carbon concentrations measured near roadways in Nairobi, Kenya

2019 ◽  
Vol 68 ◽  
pp. 99-109 ◽  
Author(s):  
Michael J. Gatari ◽  
Patrick L. Kinney ◽  
Beizhan Yan ◽  
Elliott Sclar ◽  
Nicole Volavka-Close ◽  
...  
Keyword(s):  
Black Carbon ◽  
Carbon Concentrations

Characterizing the Impact of Traffic and the Built Environment on Near-Road Ultrafine Particle and Black Carbon Concentrations

2014 ◽  
Vol 2014 (1) ◽  
pp. 1462
Author(s):  
Scott Weichenthal* ◽  
William Farrell ◽  
Mark Goldberg ◽  
Lawrence Joseph ◽  
Marianne Hatzopoulou
Keyword(s):  
Built Environment ◽  
Black Carbon ◽  
Ultrafine Particle ◽  
The Impact ◽  
Carbon Concentrations
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