PM2.5 Hyaline basidiospores, Cladosporium and total spore counts were correlated to factor Ba/Ca/Fe/Zn/K/Si Chemical composition of PM2.5 (p < 0.05). Genera Pen/Asp were correlated to the total mass of PM2.5 (p < 0.05) and colorless ascospores were correlated to humidity (p < 0.05). 4.232 Seasonal characterization of PM2.5 mass and its 2-, OC, and EC. The major chemical components of PM2.5 shifted from SO4 2- in winter to OC and SO 4 2- in early summer in seasonal variations. In summer, the PM2.5 mass starts to decrease due mainly to the enhanced impact of the aged marine air masses and
PM2.5 is generated by all types of combustion:motor vehicles, power plants, wood burning and some industrial processes. Most fine particle pollution is formed when organic compounds, nitrogen oxides, ammonia and sulfur dioxide react in the atmosphere to form secondary PM2.5. Airborne PM2.5 Chemical Components and Low Birth Dec 01, 2012 · Background:Previous studies on air pollutants and birth outcomes have reported inconsistent results. Chemical components of particulate matter 2.5 µm (PM 2.5) composition are spatially -heterogeneous, which might contribute to discrepancies across PM 2.5 studies.. Objectives:We explored whether birth weight at term is affected by PM 2.5, PM 10 (PM 10 µm), and gaseous Associations of PM2.5 Constituents and Sources with Feb 01, 2014 · Composition of PM 2.5 in Seoul, Korea, is more similar to PM 2.5 in the western United States than PM 2.5 in the eastern United States (Son et al. 2012). Variations in composition may affect health risks and explain why effect estimates for PM 2.5 , measured by total mass, differ by location.
Dec 13, 2019 · Chemical Composition of PM2.5 from a Geophysical-Statistical Method that Combines Information from Satellites, Models, and Monitors, presented by Aaron van Donkelaar, American Geophysical Union Fall Meeting, San Francisco, CA, USA, Dec 9, 2019. Bayesian-Based Ensemble Source Apportionment of PM2.5 A Bayesian source apportionment (SA) method is developed to provide source impact estimates and associated uncertainties. Bayesian-based ensemble averaging of multiple models provides new source profiles for use in a chemical mass balance (CMB) SA of fine particulate matter (PM2.5). The approach estimates source impacts and their uncertainties by using a short-term application of four Chemical Compositions and Sources Contribution of May 06, 2020 · Chemical composition and sources of PM1 and PM2.5 in Beijing in autumn. Sci. Total. Environ. 630, 7282 (2018). ADS CAS PubMed Google Scholar 9. Liu, H. M. et
Oct 04, 2003 · The chemical composition of Toronto PM2.5 was measured daily from Feb 2000 to Feb 2001, and source apportionment was undertaken using positive matrix factorization (PMF). In Toronto, PM2.5 levels were influenced both by local urban activities and also by regional-scale transport. Although several PMF solutions were possible, an eight-source model for explaining the observed Toronto PM2.5 Particulate matter (PM10 and PM2.5) National Pollutant Overview Health effects Environmental effects Sources of emissions References Description PM10 is particulate matter 10 micrometers or less in diameter, PM2.5 is particulate matter 2.5 micrometers or less in diameter. PM2.5 is generally described as fine particles. By way of comparison, a human hair is about 100 micrometres, so roughly 40 fine particles could be placed on its Quantitative relationship between visibility and mass Jan 01, 2006 · The major contributors to mass of PM2.5 were organics, crustal elements and sulfate. The chemical composition of PM2.5 varied largely with season, but was similar at different monitor stations in the same season. The fine particles (PM2.5) cause
The main chemical component of the wintertime PM2.5 in the Salt Lake Valley is ammonium nitrate, which forms via reversible reactions of gas phase ammonia and nitric acid. Hence a proper understanding of the particulate pollution requires detailed information on the The sensitivity of PM 2.5 acidity to meteorological Atmospheric Chemistry and Physics (2019-07-01) . The sensitivity of PM<sub>2.5</sub> acidity to meteorological parameters and chemical composition changes:10 Uticaj suspendovanih estica " PM2,5" iz vazduha ivotne Aim:To assess the impact of PM2.5 on total mortality, cardiovascular and respiratory hospital morbidity of the adult population of the City of Novi Sad. Also, the aim of the study was to determine the concentration and chemical composition of ambient PM 2.5 particles in the territory of the City of Novi Sad, on daily and annual bases, taking into account the impact of meteorological parameters.
Results showed that PM 2.5, SO 2, NO 2, NH 3, O 3 and CO concentrations decreased by 40.9%, 46.0%, 29.0%, 40.6%, 11.0% and 44.4%, respectively. Significant decreases were also observed for NO 3-(32.5%), SO 4 2-(52.9%), NH 4 + (56.0%), Cl-(64.6%) and K + (68.2%), on average. Enhanced PM 2.5