17/07/2020· To deal with the temporal effects, we also controlled for week number (centered) and its squared term to capture the potential nonlinearity. Model. To examine how PM might affect depression in China, we employed 2-way fixed effects model that is easy to rule out confounding effects rising from time-invariant, city-level factors. We use the lagged values (t − 1) of all explanatory …
04/01/2015· The annual mean concentrations of were 186, 180 and 218 µg m–3 in 2011, 2012 and 2013, respectively. These concentrations were 5–6 times greater than the National Ambient Air Quality Standards of China (annual value of 35 µg m–3) and indicated the presence of severe pollution in Zhengzhou. Particulate organic matter (OM) contributed the most (18–26%) to the annual …
19/05/2014· To estimate the deposition effect of (particle matter with aerodynamic diameter < µm) in forests in northern China, we used the gradient method to measure the deposition velocity of during the winter and spring above a deciduous forest in Olympic Forest Park and above a coniferous forest in Jiufeng National Forest Park. Six aerosol samplers were placed on two towers at …
01/06/2021· In addition, DPEC mitigation scenarios can better capture China's PM decline during 2015–2019 (22% under SSP2-45-policy and 30% under SSP1-26-best) with observations (∼28%) than CMIP6 emissions. With the effects of current-year bias and inadequate considerations of pollution control policies, PM projections in 2030 and 2050 with CMIP6 mitigation scenarios are 42%–48% (9–13 …
This study investigated the feasibility of using polycaprolactone (PCL) nanofiber-based air filters to capture particles emitted from fused deposition modeling (FDM) 3D printing. Generation and aggregation of emitted particles were investigated under different testing environments. The results … Capturing Emissions from 3D Printing via Nanofiber-based Air Filter Sci Rep. 2017 Sep …
GEOS-Chem underestimates NO2 by about 17 μgm -3 and PM2:5 by 35 μgm -3 on average over fall–winter 2013. It reproduces the diurnal variability for both pollutants. For the day-to-day variation, GEOSChem reproduces the observed north–south contrasting mode for both pollutants but not the Eastern China synchronous mode (especially for NO2). The model errors are due to a first model …
01/01/2015· Beijing city (China) is among the areas in which aerosol particulate pollution is the highest in the world. According to NASA-Released Images of Beijing Air Pollution in China by on January 15th, 2013, China was shown to be smothered by a layer of haze. The gray and yellow-tinged clouds visible on the map are areas heavily affected by air pollution. At the time the image was taken, …
03/10/2018· Design of electret polypropylene melt blown air filtration material containing nucleating agent for effective capture†. Haifeng Zhang, Jinxin Liu, Xing Zhang, Chen Huang and Xiangyu Jin * Engineering Research Center of Technical Textiles, Ministry of Education, College of Textiles, Donghua University, No. 2999 North Renmin Road, Songjiang, Shanghai 201620, China. E-mail: …
04/01/2015· The annual mean concentrations of were 186, 180 and 218 µg m–3 in 2011, 2012 and 2013, respectively. These concentrations were 5–6 times greater than the National Ambient Air Quality Standards of China (annual value of 35 µg m–3) and indicated the presence of severe pollution in Zhengzhou. Particulate organic matter (OM) contributed the most (18–26%) to the annual …
31/07/2019· ABSTRACT Elemental composition and morphology were studied for atmospheric fine particles () collected from a fast developing city, Hefei, with an aim of tracing the potential emission sources. The sampling was conducted every month at two urban sites between June 2014 and December 2015. We used X-ray fluorescence (XRF) to determine the elemental composition, and scanning …
15/05/2020· High-resolution simulation is used to estimate chronic and acute premature deaths attributable to over China. ... but we note that much finer scale models may be needed to capture the different features of air pollution and health impacts in urban and rural areas. At a national level the impacts of interannual variability in meteorological conditions on PM concentrations and …
The types of shrubs and broadleaf trees that have the ability to capture from the air are most effective when leaves have fully developed. In the leafless season, the conifer and mixed tree types are the most effective in removing dust from the air. For all kinds of forest types and stages of leaf growth, the concentration is highest in the morning but lower in the afternoon and evening. Grassland …
21/03/2020· ABSTRACT Risk assessment methods of the US Environment Protection Agency ( EPA) were employed to estimate lifetime cancer risk in Beijing using the following fine particulate matter () components: six elements and 16 EPA priority polycyclic aromatic hydrocarbons (PAHs), and lifetime non-cancer hazard quotients (HQ) using 11 elements, based on data collected in Beijing …
07/09/2018· Eastern China (27–41 ∘ N, 110–123 ∘ E) is heavily polluted by nitrogen dioxide (NO 2), particulate matter with aerodynamic diameter below µ m (PM ), and other air pollutants vary on a variety of temporal and spatial scales, with many temporal scales that are nonperiodic and nonstationary, challenging proper quantitative characterization and visualization.
stands for Particulate Matter μm; it’s not necessarily an actual mask rating. It sounds like that mask is intended to filter out air pollution, since that’s typically measured at 10μm (microns/micrometers) and μm. is more likely ...
12/04/2021· This could reflect the fact that the traditional Chinese winter solar term Xiao Xue (, “light snow”) begins on this date (Li, 2006), a period associated with the preparation of warm foods as the ambient temperatures in northern China drop; a similar elevation of palmitic acid and stearic acid has been observed around the same week in a more recent study in Shanghai (Q. Wang et al., 2020).
capture quantity, while no significantly posi-tive correlations were found for leaf hairs and stomatal densi-ty. Broadleaf species are conducive to PM capture for their rich leaf morphology and have an edge over coniferous in PM capture per leaf area. However, coniferous had a larger PM capture capability per tree due to the ...
03/12/2019· Abstract. From 2013 to 2017, with the implementation of the toughest-ever clean air policy in China, significant declines in fine particle (PM ) concentrations occurred we estimate the drivers of the improved PM air quality and the associated health benefits in China from 2013 to 2017 based on a measure-specific integrated evaluation approach, which combines a bottom …
01/02/2021· Positive surface charge ( mV) of membrane facilitated to capture PM by electrical attraction force. ... This work was supported from the National Natural Science Foundation of China (Ref: 21706224), the Science and Technology Innovation Commission of Shenzhen Municipality (Ref: JCYJ20180307123906004), and the Research Grants Council of Hong Kong through General …
stands for Particulate Matter μm; it’s not necessarily an actual mask rating. It sounds like that mask is intended to filter out air pollution, since that’s typically measured at 10μm (microns/micrometers) and μm. is more likely ...
This study investigated the feasibility of using polycaprolactone (PCL) nanofiber-based air filters to capture particles emitted from fused deposition modeling (FDM) 3D printing. Generation ...
16/02/2015· After 100 h, the PAN filter still maintained a high PM and PM 10– removal efficiency of 95–100% and 100%, respectively, and the pressure drop only increased slightly from ~2 to ~5 Pa ...
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