Eleven years (2005–2015) of data from long-term monitoring at a Japanese remote background site in Wajima, were analyzed to investigate temporal trends and sources. Water-soluble inorganic ions (WSIIs) for aerosol chemical composition. The total WSIIs concentration was 7.93 ± 3.93 μg/m3, accounting 42.3% TSP mass, ranged 11.4 93.9%. SO42− is the most abundant ion, contributing WSII mass 18.0 79...

This study presents the mass concentrations of PM2.5, O3, SO2 and NOx at one urban, one suburban and two rural locations in the Changchun region from September 25 to October 27 2013. Major chemical components of PM2.5 at the four sites were daily sampled and analyzed. Most of daily concentrations of SO2 (7-82μg/m3), O3 (27-171μg/m3) and NOx (14-213μg/m3) were below the limits of the National Am...

We investigated water-soluble ions (WSIs) of aerosol samples collected from 2016 to 2017 in Lanzhou, a typical semi-arid and chemical-industrialized city Northwest China. WSIs concentration was higher the heating period (35.68 ± 19.17 ?g/m3) lower non-heating (12.45 4.21 ?g/m3). NO3?, SO42?, NH4+ Ca2+ were dominant WSIs. The SO42? has decreased recent years, while NO3? level increasing. affecte...

Abstract. Particle acidity (aerosol pH) is an important driver of atmospheric chemical processes and the resulting effects on human environmental health. Understanding factors that control aerosol pH critical when enacting strategies targeting specific outcomes. This study characterizes at a land–water transition site near Baltimore, MD, during summer 2018 as part second Ozone Water-Land Enviro...

Water soluble inorganic ions (WSIIs) are important components in PM2.5 and could strongly affect the acidity hygroscopicity of PM2.5. In order to achieve seasonal characteristics determine potential sources WSIIs Hangzhou, online systems were used measure hourly mass concentrations (SO42−, NO3−, NH4+, Cl−, Na+, K+, Ca2+ Mg2+) as well PM2.5, NO2 SO2 at an urban site for one month each season (Ma...

From January to March 2015, an atmospheric aerosol measurement campaign, “Aerosoles en Ciudad Universitaria 2015” (ACU15), was carried out in Mexico City determine the particles’ optical properties and chemical composition. Two photoacoustic spectrometers measured scattering absorption coefficient at two different wavelengths. The average 532 nm 12.71 ± 9.48 Mm−1 870 10.35 7.36 Mm−1. 65.63 47.1...

Groundwater contamination in coastal areas has attracted widespread attention. However, studies on the hydrogeochemical characteristics and controlling mechanisms aquifers are still lacking. In this study, 71 sets of groundwater samples were collected during dry wet seasons a city, Shandong Province. Correlation principal component analyses used to identify pollution sources. Meanwhile, Piper d...

Abstract. Aerosol acidity plays a key role in regulating the chemistry and toxicity of atmospheric aerosol particles. The trend pH its drivers is crucial understanding multiphase formation pathways aerosols. Here, we reported first analysis from 2011 to 2019 eastern China, calculated with ISORROPIA model based on observed gas compositions. implementation Air Pollution Prevention Control Action ...

Abstract. To better understand the origins and seasonality of atmospheric aerosols in North China, we collected fine (PM2.5) at an urban site (Nankai District, ND) a suburban (Haihe Education Park, HEP) Tianjin from July 2018 to 2019. The PM2.5 was studied for carbonaceous, nitrogenous ionic components stable carbon nitrogen isotope ratios total (δ13CTC) (δ15NTN). On average, mass concentration...

BACKGROUND Estimating the health effects of ambient air pollutant mixtures is necessary to understand the risk of real-life air pollution exposures. METHODS Pediatric Emergency Department (ED) visit records for asthma or wheeze (n = 148,256), bronchitis (n = 84,597), pneumonia (n = 90,063), otitis media (n = 422,268) and upper respiratory tract infection (URI) (n = 744,942) were obtained from...