News Update on Air Pollution Research: May – 2019

Air pollution and health

The health effects of pollution are subject to intense study in recent years. Exposure to pollutants like mobile participate matter and gas has been related to will increase in mortality and hospital admissions thanks to metabolism and upset. These effects are found in short studies, that relate day-after-day variations in pollution and health, and long-run studies, that have followed cohorts of exposed people over time. Effects are seen at terribly low levels of exposure, and it’s unclear whether or not a threshold concentration exists for stuff and gas below that no effects on health area unit probably. during this review, we tend to discuss the proof for adverse effects on health of elect air pollutants. [1]

Health Effects of Fine Particulate Air Pollution: Lines that Connect

Efforts to grasp and mitigate the health effects of material (PM) pollution have a fashionable and attention-grabbing history. This review focuses on six substantial lines of analysis that are pursued since 1997 that have helped elucidate our understanding regarding the results of PM on human health. There has been substantial progress within the analysis of PM health effects at totally different time-scales of exposure and in the exploration of the form of the concentration-response perform. There has conjointly been rising proof of PM-related vas health effects and growing information relating to interconnected general pathophysiological pathways that link PM exposure with cardiorespiratory morbidity and mortality. Despite vital gaps in knowledge base and continued  reasons for a few skepticism, a comprehensive analysis of the analysis findings provides persuasive proof that exposure to fine particulate pollution has adverse effects on cardiorespiratory health. though a lot of of this analysis has been driven by environmental public health policy, these results have vital scientific, medical, and public health implications that are broader than debates over wrongfully mandated air quality standards. [2]

Air pollution: its origin and control

The first edition of the text was changed in 3 broad areas: (1) new material else in many chapters for e.g., a a lot of through coverage of particulate distributions, a mathematical analysis of the sorption wave; (2) previous material updated or removed if thought of not applicable for e.g., rewritten section on flue gas desulfurization, chapter on mobile sources; and (3) addition of recent issues. The second edition primarily continues to gift info on the subsequent areas: (1) the consequences of pollutants on health and welfare; (2) federal laws and regulations; (3) the modelling of atmosphere dispersion of pollutants; and (4) the final and specific approaches to the management of emissions-small and huge scale, mobile and stationary, combustion and noncombustion. The text discusses in some depth the mechanisms liable for the effectiveness of management devices. Instrumentation needed for watching is roofed solely briefly; some economic information square measure given for comparative functions. [3]

The mediating effect of immune markers on the association between ambient air pollution and adult-onset asthma

We aim to research to what extent a group of immune markers mediate the association between pollution and adult-onset respiratory illness. we tend to thought-about semipermanent exposure to multiple pollution markers and a panel of thirteen immune markers in peripheral blood samples collected from one hundred forty adult cases and 199 managements employing a nested-case control style. we tend to tested associations between air pollutants and immune markers and adult-onset respiratory illness victimization mixed-effects (logistic) regression models, adjusted for unsupportive variables. so as to guage a potential mediating impact of the total set of immune markers, we tend to modelled the connection between respiratory illness and pollution with a partial least sq. path model. we tend to ascertained a robust positive association of IL-1RA [OR one.37; ninety fifth CI (1.09, 1.73)] with adult-onset respiratory illness. Univariate models didn’t yield any association between pollution and immune markers. However, mediation analyses indicated that V-day of the impact of pollution on risk of adult-onset respiratory illness was mediate through the system once considering all immune markers as a latent variable (path constant (β) = 0.09; ninety fifth CI: (−0.02, 0.20)). This impact gave the impression to be stronger for allergic respiratory illness (22%; β = 0.12; ninety fifth CI: (−0.03, 0.27)) and overweight subjects (27%; β = 0.19; ninety fifth CI: (−0.004, 0.38)). Our results provides confirming proof for a mediating impact of the system within the association between pollution and adult-onset respiratory illness. [4]

Evaluation of the Impact of Motorcycles in Urban Transport on Air Pollution: A Case of Douala City in Cameroon

Aims: This work aimed to judge the impact of bike taxis on pollution for the actual case of metropolis city in Cameroon.

Study Design:  Samples were collected from motorbike drivers Associate in Nursingd an exhaust gas analyzer was used for higher understanding of this space of activity. it had been done to get the various amounts of pollutants emitted by these motorcycles in several traffic things.

Place and length of Study: metropolis Urban Community, National Advanced faculty of construction, and Energy, Water and atmosphere Laboratory of National Advanced faculty of Engineering (University of capital of Cameroon I) between Feb 2017 and June 2018.

Methodology: The applied mathematics knowledge regarding the motorcycles in circulation, calculable around 233,799, within the transport sector between 2009 and 2013 in Cameroon, were used for the current study. mistreatment these knowledge, the correlation of the evolution of motorcycles in circulation within the transport sector was established. For motorcycles exhausts, part pollutants particularly, dioxide (CO2), monoxide (CO), pollutant (NOx) and organic compound (HC) were measured.

Results: A survey of five hundred motorbike taxis, discovered that fifty eight of motorcycles were nonheritable before unleash, fifty six was but five years recent and ninety fifth consumed gas. The survey additionally discovered that sixty fourth of motorcycles operational in urban transport had a tax power of between vi and seven H.P.. the various amounts of pollutants, emitted on a sample of forty five motorbike taxis, followed that in slow traffic in urban areas (5 km/h), CO (depending on their aging condition) was emitted between zero.40 and 3.02 g/kg; the monetary unit three commonplace on motorbike emissions recommends a limit of one g/kg. within the same traffic state of affairs, most values for HC and Roman deity, were 0.62 g/kg and three.10×10‑3 g/kg, respectively; values were inside the bounds set by constant commonplace, namely 0.8 g/kg and zero.15 g/kg severally. The statistics accessible between 2007 Associate in Nursingd 2011 discovered an virtually linear evolution of the “motorcycle” development in urban centers in Cameroon, creating it doable to place 647,000 motorcycles into circulation between 2007 and 2018.

Conclusion: Traffic state of affairs, aging of the motorbikes and nature of the fuel discovered their influence on the emissions of pollutants by motorcycle taxis. These results are a great tool to watch the pollution levels caused by motorcycles in urban transport. [5]


[1] Brunekreef, B. and Holgate, S.T., 2002. Air pollution and health. The lancet, 360(9341), pp.1233-1242. (Web Link)

[2] Pope III, C.A. and Dockery, D.W., 2006. Health effects of fine particulate air pollution: lines that connect. Journal of the air & waste management association, 56(6), pp.709-742. (Web Link)

[3] Wark, K. and Warner, C.F., 1981. Air pollution: its origin and control. (Web Link)

[4] The mediating effect of immune markers on the association between ambient air pollution and adult-onset asthma

Nahid Mostafavi, Ayoung Jeong, Jelle Vlaanderen, Medea Imboden, Paolo Vineis, Debbie Jarvis, Manolis Kogevinas, Nicole Probst-Hensch & Roel Vermeulen

Scientific Reportsvolume 9, Article number: 8818 (2019) (Web Link)

[5] Talla, A., Ngohe-Ekam, P. S. and Nkeumaleu, A. T. (2018) “Evaluation of the Impact of Motorcycles in Urban Transport on Air Pollution: A Case of Douala City in Cameroon”, Journal of Scientific Research and Reports, 20(1), pp. 1-11. doi: 10.9734/JSRR/2018/43224. (Web Link)

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