Themed collection Atmospheric chemistry

We engage in research motivated by climate change and the impacts of pollution on air, water, and human health. The scientific community need to improve communication and knowledge exchange across disciplines to address pressing research questions holistically.

PFAS are detected in particulate matter around the world.

Global warming profoundly affects not only mountainous and polar environments, but also the global and regional cycling of pollutants.

EC-containing airborne particles have diverse oxidative potentials dependent on their physical and chemical properties, which can be also changed by atmospheric aging processes.

This review summarizes in detail the current knowledge in the chemical compositions, formation mechanisms, and physicochemical properties of secondary organic aerosols formed from monocyclic aromatic hydrocarbons.

A comprehensive study of indoor VOCs, revealing how seasonality and location shape indoor VOC exposure.

The indoor surfaces of dwellings across the United States range exhibit a wide range of chemical compositions and physical properties, which impacts semi-volatile partitioning, heterogeneous chemistry and the overall properties of indoor air.

This paper provides an overview of the INGENIOUS (UnderstandING the sourcEs, traNsformations and fates of IndOor air pollUtantS) project, aiming to better understand air pollution in homes.

The Indoor Air Quality Climate Change (IAQCC) model was applied to predict the long-term impact of atmospheric changes on indoor particle concentrations based on different climate scenarios.

Measurements from the HOMEChem campaign have been constrained and modelled, identifying how cooking and cleaning affect indoor radical reactivities and concentrations.

A novel application of mobile monitoring to investigate the spatial distribution of vehicular and non-vehicular urban particulate matter sources in London, UK.

Products of the oxidation of BTH by OH in air.

Ice nucleation processes in the earth's atmosphere are critical for cloud formation, radiation, precipitation, and climate change.

Multiphase interactions and chemical reactions at indoor surfaces are of particular importance due to their impact on air quality in indoor environments with high surface to volume ratios.

Gas phase reactive nitrogen (N_r) species in a commercial kitchen are mainly composed of expected species with many additional species completing the budget.

We quantified the lifetime of cashmeran, a musk compound, against 20 ppbv of O₃ to be 85 days. In the presence of O₂, cashmeran may influence the oxidative capacity indoors via production of secondary OH radicals (up to 5.1 × 10⁵ molec cm⁻³).

Ozone production can explain most indoor air quality impacts of 222 nm germicidal ultraviolet light (GUV₂₂₂). However, GUV₂₂₂ causes more new particle formation than is explained by ozone chemistry.

A system for semi-continuous real-time monitoring of gas- and particle-phase water soluble organic carbon (WSOC) was used to provide quantitative insights into the concentrations dynamics of WSOC in indoor air.

Cooking and cleaning are common sources of indoor air pollutants, including volatile organic compounds (VOCs).

Indoor oxidant concentrations in vehicles strongly depends on the ventilation rates and photochemistry within the vehicle.

Organic aerosol formed from ocimene photooxidation has more oligomers compared to organic aerosol formed from other acyclic terpene precursors.

Reactive oxygen species (ROS) are present on indoor surfaces and form dynamically on surfaces coated with lipid mixtures that simulate indoor surface coatings.

Devices using 222 nm germicidal ultraviolet light (GUV222) have been marketed to reduce virus transmission indoors. However, GUV222 generates ozone which can react with gases and surfaces to create undesirable air byproducts.

PM and CO concentrations below 500 m increased substantially during haze. Influences of horizontal and vertical transport were observed on vertical profiles.

This study shows that volatile and semi-volatile organic gases are emitted during light and heavy braking. These emissions will remain as we transition to zero exhaust emission vehicles and must be included in air pollution and climate assessments.

When the unsaturated CIs at the CC-terminal vinyl electrophilic center react with the OC–OH moiety (TFA), a new adduct, TFAAAH, is formed, and it can act as a potential source of secondary organic aerosols (SOAs).

Cleaning products emit a range of volatile organic compounds (VOCs), including some which are hazardous or can undergo chemical transformations to generate harmful secondary pollutants.

Monte Carlo simulations of long-term indoor organic surface film growth were done. Film composition was resolved by volatility, particle deposition or gas absorption formation mechanisms, and indoor source process.

We establish laboratory-photochemical ageing in the 1800 m³ environmental chamber “PHOTO-LAC” to study the atmospheric processing of dense wildfire plumes.

This study describes laboratory experiments on the reaction HOCl with chloride-containing aerosol and aerosol containing selected organic compounds with and without chloride.

Wildfire activity is increasing in the continental U.S. and can be linked to climate change effects and nutrient emissions, with potential effects on downwind ecosystems.

The effect of humidity on organic hydroperoxide (ROOH) removal from air to real indoor surface films was investigated. A novel flow reactor for studying uptake kinetics of indoor pollutants on indoor materials is introduced.

Online gas- and particle-phase measurements in a commercial kitchen reveal exposure risks and outdoor air impacts during cooking and cleaning.

High levels of reactive chemicals may be emitted to the indoor air during household surface cleaning, leading to poorer air quality and potential health hazards.

The effect of adding a plug-in air freshener into 60 houses was hard to detect due to pre-existing VOCs from other sources; in homes with low ventilation rates however small increases in monoterpenes were seen, consistent with emission rates.

The spatial and temporal patterns in the concentrations of D4, D5 and D6 in the atmosphere measured with passive samplers along a European and a Canadian transect are largely consistent with the current understanding of their atmospheric fate.

A robust and quantitative instrument that measures total gas-phase reactive nitrogen (tN_r) has been developed for indoor air quality surveys. It can focus on NO_x, HONO, and NH₃ levels indoors, from the complete tN_r budget, on timescales of 5–20 min.

This work highlights how the pH of the atmospheric aqueous phase can influence the degradation of carboxylic acids during nitrate-mediated photooxidation.

Results of this study indicate the contribution of regional as well local sources towards long range atmospheric transport (LRAT) of persistent organic pollutants (POPs) to the colder areas of Pakistan, where these act as a secondary source of POPs.

New measurements show that cooking aerosol released indoors can partition as it dilutes through a home and to the outdoor atmosphere, impacting both indoor and outdoor air quality.

Chlorinated cleaning products containing hypochlorous acid (HOCl) and hypochlorite ion (OCl⁻) act as sources of toxic chloramines (NH₂Cl, NHCl₂, NCl₃) and atmospheric oxidant precursors (i.e. Cl₂) which impact air quality.

The atmospheric fate of perfluorocarboxylic acids (PFCAs) has attracted much attention in recent decades due to the role of the atmosphere in global transport of these persistent chemicals.

The uptake of WSOC_g from biomass burning into ALW results in compounds that remain in the particle phase upon drying.

As nitrogen-containing organic carbon of atmospheric relevance, the water uptake of two phenolic compounds, o-aminophenol and p-aminophenol, is investigated under sub- and supersaturated conditions through the lens of aerosol-cloud interactions.

We suggest a re-evaluation of two reaction rate constants to be able to better model iodine emission from the ozonolysis of iodide in the presence of chloride.

Measurements of the kinetics of accretion reactions involving organic compounds typical of those present in atmospheric aerosol particles demonstrate the potential importance of peroxyhemiacetal and ester formation in a single organic phase and in phase-separated organic/aqueous mixtures containing a sulfuric acid catalyst.

The comprehensive reaction mechanism of Fe^III–citrate multiphase photochemistry and formation of unexplored colloidal reaction products that contribute to terrestrial light-absorbing materials.

This work highlights how the pH of the atmospheric aqueous phase can influence the reactivities of phenolic compounds and brown carbon formation/evolution during nitrate-mediated photooxidation.

We studied the mechanisms of cooking oil decomposition that lead to emission of aldehydes, an important group of air pollutants, from food cooking.

Cleaning surfaces with sodium hypochlorite (NaOCl) bleach can lead to high levels of gaseous chlorine (Cl₂) and hypochlorous acid (HOCl); these have high oxidative capacities and are linked to respiratory issues.

Large fluoropolymer manufacturing plants are major sources of per- and polyfluoroalkyl substances (PFAS) to the environment; we measured legacy and emerging PFAS in air to provide insights into near-source PFAS profiles.

The residents are likely to experience harmful thirdhand exposure due to the indoor partitioning of flavoring agents added to the e-cigarettes and hookah tobacco.

India is a country with more than 67% of its population (947 million) residing in rural areas and 33% in urban areas (472 million) as of 2020.

Submicron soot particles (<1.0 μm in aerodynamic diameter) are responsible for global warming and health burdens worldwide.

Ozone chemistry taking place on indoor surfaces is predicted to increase inhalation exposure of reactive oxygen species in indoor aerosols.

In this study, we report the heterogeneous chemistry of ozone with urban road dust and anti-icer. We present a novel pathway for chlorine activation during ozone uptake by anti-icer and discuss its potential air quality impacts in cold-climate urban regions.

The removal of volatile content enhances the ice nucleation of soot particles by increasing the particle porosity and surface wettability.

The conversion of coal fly ash to zeolites is a sustainable solution for its utilization. One important issue is to clarify the effect of coal fly ash composition on the carbon sequestration potential of the derived zeolites.

The degradation of acephate by OH radicals in the environment.

The effect on population exposure of falling nickel concentrations in air in the Swansea Valley over the last 50 years is assessed.

A marine test-bed diesel engine was used to study how international fuel sulfur content (FSC) regulations and wet scrubbing can affect physical properties of submicron exhaust particles.

Deposition of atmospheric pollutants enhances soluble reactive nitrogen by 1.7 and 0.9 TgN per year in the Arabian Sea and Bay of Bengal, respectively, leading to an increase in primary production.

Monte Carlo simulations suggest that organic aerosol repartitioning during transport indoors is often kinetically limited due to a low bulk diffusivity, but liquid and some semisolid particles can achieve equilibrium repartitioning during indoor particle lifetimes.

We study the uptake of atmospheric mercury by vegetation in a chemical transport model and available observations. Due to the importance of this sink in the global mercury cycle, perturbations to forested areas can elevate mercury risks.

Observations of reactive uptake of ozone to commercial azo dyes used in consumer products suggest multi-phase ozonolysis of azo dyes in the indoor environment.

Spatially resolved atmospheric gaseous elemental mercury (GEM) concentrations from an urban area in the Southern Hemisphere are reported for the first time.

Fog processing of atmospheric aerosol enhances the solubility and the dissolution kinetics of particle-bound metal ions.

We use a causal discovery algorithm based on a temporal convolution network (TCN) to discover the drivers of surface ozone variability over Antarctica.

The SeaSCAPE campaign replicated the marine atmosphere in the laboratory to investigate the links between biological activity in the ocean and the properties of primary sea spray aerosols, volatile organic compounds, and secondary marine aerosols.