Themed collection Celebrating Environmental Science: Atmospheres’ First Year
Optimising air quality co-benefits in a hydrogen economy: a case for hydrogen-specific standards for NOx emissions
Hydrogen may play a major role as an energy source to support net zero but combustion leads to emissions of NOx, a key air pollutant. Delivering optimal air quality co-benefits may need more ambitious hydrogen-specific emission standards developing.
Aging of atmospheric aerosols and the role of iron in catalyzing brown carbon formation
Iron in mineral dust can catalyze reactions with atmospheric organics that lead to the formation of brown carbon (BrC) that impact the climate in a number of ways.
Aerosol presence reduces the diurnal temperature range: an interval when the COVID-19 pandemic reduced aerosols revealing the effect on climate
DTRs from February to June during the COVID-19 pandemic are greater than 3 standard deviations above the climatological mean DTR.
Molecular characterization of ultrafine particles using extractive electrospray time-of-flight mass spectrometry
Using real-time simultaneous gas- and particle-phase data, the condensation of naphthalene and β-caryophyllene oxidation products on a molecular level is discussed.
Human health risk assessment of atmospheric mercury inhalation around three artisanal small-scale gold mining areas in Indonesia
To clarify the human health risk of inhalation of gaseous elemental mercury (GEM), we measured GEM concentrations in three artisanal small-scale gold mining (ASGM) areas of Palu (Central Sulawesi), Muara Aman (Benkulu in Sumatra), and Palangka Raya (Central Kalimantan).
Characterization of black carbon aerosols over Indian Antarctic station, Maitri and identification of potential source areas
Black carbon measurements at Maitri, Antarctica during XXXVIII Antarctica expedition and found 82 ng m−3 and Patagonia is a definitive BC origin in addition to the day-to-day station related activities.
Cytotoxicity and chemical composition of women's personal PM2.5 exposures from rural China
Direct measurement with personal samplers captures the chemical complexity of PM2.5 exposures better than fixed monitors. To investigate biological effects, lung cells were exposed to extracts of exposure PM2.5 samples.
Natural greenhouse gas and ozone-depleting substance sources and sinks from the peat bogs of Connemara, Ireland from 1994–2020
New emissions of methane and chloroform, with concurrent depositions of ozone and hydrogen were determined from the peat bogs of Ireland.
Size-resolved characterization of organic aerosol in the North China Plain: new insights from high resolution spectral analysis
Size-resolved organic aerosol (OA) analysis elucidated largely different size distributions of primary and secondary OA, and oxidation states between urban and rural sites in different seasons.
Insights into HONO sources from observations during a solar eclipse
Nitrous acid (HONO) is a key precursor to the principal atmospheric oxidant OH. HONO measurements during a solar eclipse show little variation, implying the main HONO sources are photolytic, approximately balancing removal through photolysis.
A computationally efficient model to represent the chemistry, thermodynamics, and microphysics of secondary organic aerosols (simpleSOM): model development and application to α-pinene SOA
Secondary organic aerosols (SOA) constitute an important fraction of fine-mode atmospheric aerosol mass.
Modeling the effect of reduced traffic due to COVID-19 measures on air quality using a chemical transport model: impacts on the Po Valley and the Swiss Plateau regions
Our results indicate that lockdown measures induced a mild increase in secondary organic aerosol (SOA) concentrations in areas with substantial reductions in nitrogen dioxide (NO2) concentrations, i.e. the “Greater Milan” area.
Emerging Investigator Series: COVID-19 lockdown effects on aerosol particle size distributions in northern Italy
Impact of lockdown measures on the air pollutants and particle number size distribution.
Photo-oxidation of pinic acid in the aqueous phase: a mechanistic investigation under acidic and basic pH conditions
The mechanism of aqueous-phase OH-oxidation of pinic acid was investigated for the first time, and norpinic acid and 3-methyl-1,2,3-butanetricarboxylic acid were identified as major products. The mechanism is pH-dependent, with enhanced yields under basic conditions.
Unraveling the complexity of atmospheric brown carbon produced by smoldering boreal peat using size-exclusion chromatography with selective mobile phases
Water-soluble BrC in freshly emitted boreal peat combustion particulate matter spans a wide range of molecular sizes, polarities, and light absorption properties; in addition, its largest fraction undergoes solvent-dependent aggregation/dissociation.
Formation of atmospheric molecular clusters from organic waste products and sulfuric acid molecules: a DFT study
DFT calculations show that skatole oxidation products may likely initiate the formation of nucleation precursors in the atmosphere.
Unique calibration of passive air sampling for field monitoring of PAHs with polyethylene thin films across seasons and locations
For better insight into passive air sampling, we monitored PAHs with PE sheets during 8 seasons at 3 locations. A numerical model was applied to fit the limiting air-side boundary layer, which was surprisingly stable around 1 mm in all locations.
Mineral and biological ice-nucleating particles above the South East of the British Isles
Mineral dust is responsible for the ice-nucleating properties of aerosol samples collected over the British Isles below ∼−20 °C, while an additional source, potentially biogenic, must explain the ice-nucleating properties at higher temperatures.
Insights into the molecular composition of semi-volatile aerosols in the summertime central Arctic Ocean using FIGAERO-CIMS
Molecular-level analysis of High Arctic aerosols sampled on a cruise to the North Pole shows: (1) a wide range of semi-volatile organic compounds, (2) no clear relationship between DMS oxidation products in the gas- and particle-phase
Viscosity and liquid–liquid phase separation in healthy and stressed plant SOA
Molecular composition, viscosity, and phase state were investigated for secondary organic aerosol derived from synthetic mixtures of volatile organic compounds representing emissions from healthy and aphid-stressed Scots pine trees.
On-road emissions of Euro 6d-TEMP passenger cars on Alpine routes during the winter period
Vehicles show higher emissions at cold temperature. Nevertheless, emissions during real world tests can be below Euro 6d-TEMP requirements. The relatively high PN emissions from gasoline and PHEV vehicles indicate there is still room for improvement.
Peroxy radical kinetics and new particle formation
Chamber experiments may over emphasize peroxy radical cross reactions due to lower concentrations of reactants that directly convert OH into HO2.
Comprehensive organic emission profiles, secondary organic aerosol production potential, and OH reactivity of domestic fuel combustion in Delhi, India
This study examines the volatility distribution of organic emissions from solid fuel combustion sources from Delhi, India, and examines the chemical drivers of the OH reactivity and the secondary organic aerosol production potential.
Measurements of the partitioning of nitric acid and sulfuric acid in aqueous/organic phase-separated systems
Measurements of partitioning of nitric acid and sulfuric acid between aqueous and organic phases show organic-phase acid is significant, which has implications for aerosol chemistry factors. These acids can then participate in organic reactions.
Effect of aromatic ring substituents on the ability of catechol to produce brown carbon in iron(III)-catalyzed reactions
Our previous work demonstrated formation of highly insoluble and strongly light-absorbing organic particles in reactions between catechol or guaiacol with Fe(III) under pH = 3 conditions characteristic of aerosol liquid water.
Multicomponent diffusion in atmospheric aerosol particles
Condensed phase mass transport in single aerosol particles is investigated using a linear quadrupole electrodynamic balance (LQ-EDB) and the Maxwell–Stefan (MS) framework.
Quenching of ketone triplet excited states by atmospheric halides
The photosensitized chemistry of three aromatic ketones (xanthone, flavone, and acetophenone) and also of secondary organic aerosols (SOAs) arising from the photo-oxidation of naphthalene was investigated by means of transient absorption spectroscopy.
Investigating the evolution of water-soluble organic carbon in evaporating cloud water
Cloud cycling plays a key role in the evolution of atmospheric particles and gases, producing secondary aerosol mass and transforming the optical properties and impacts of aerosols globally.
Near-canopy horizontal concentration heterogeneity of semivolatile oxygenated organic compounds and implications for 2-methyltetrols primary emissions
This study calls attention to the primary emissions of semivolatile oxygenated organic compounds (SV-OVOCs) and demonstrates how mapping out the near-canopy concentration can effectively isolate atmospheric SV-OVOC production from direct emissions.
About this collection
To mark one year since Environmental Science: Atmospheres opened for submissions, we have put together a web collection to highlight the broad range of topics covered by our first articles, which link fundamental and applied research and cover global to molecular scales.