Nocturnal turbulence influences the transport and dispersion of ultrafine particles (UFP, <100nm), particularly in suburban environments, where local sources and meteorological conditions interact. At the CIRAS measurement site, the study examines how turbulent fluxes and atmospheric stability affect nanoparticle oscillations during nighttime hours, providing insights into their variability and underlying dynamics. Measurements were conducted from late September to mid-November 2023, using a Fast Mobility Particle Sizer (TSI FMPS), a Mixing-type Condensation Particle Counter (Brechtel MCPC1720), and an ultrasonic anemometer (Metek usonic-3). During the campaign, two subsets of nanoparticle oscillations were observed between (identified as Periods A and B).

A catalytic stripper integrated with a plate electrostatic aerosol classifier (CS+EAC) was designed. The electric field force within the EAC reduces the influence of thermophoretic forces on particles, resulting in improved particle penetration efficiency. The experimental results show that the penetration efficiencies of 23 nm-100 nm particles are all improved when 168 V is applied to the EAC. The 33% improvement at 23 nm and the smoother penetration efficiency curve across the 23–100 nm range will enable the portable emission measurement system (PEMS) to derive a particle concentration reduction factor that facilitates more accurate inversion of particle number concentration.

We present results from a study that quantifies the contribution of road transport and local airports to UFP concentrations in Berlin and surroundings. The set-up is a combination of measurements and modelling. An elaborate measurement campaign was made in 2021/2022 including long-term stationary measurements close to the airport, car and bicycle based mobile measurements and ALADINA drone measurements. The model set-up is a combination of regional and local dispersion model modeling, separating source contributions. Good statistical correspondence between modelled and observed particle number concentrations was found.

Black Carbon (BC) plays a key role in the earth's system, with a strong positive radiative forcing. Human exposure to BC is associated with adverse health effects. Accurate bottom-up estimates of BC emissions are challenged by wildfire occurrence, changes in energy mix, and combustion technologies. Therefore, a comprehensive BC emission inventory is needed for a good understanding of the radiative forcing and associated climate feedback and to develop any successful mitigation strategies/policies. Under the Horizon Europe project PARIS, in collaboration with the sister project EYE-CLIMA, we aim to provide a top-down, observation-informed estimate of European BC emissions.

Black carbon (BC) significantly impacts Earth’s radiative balance and public health. This study developed a comprehensive modeling system to forecast BC concentrations in Velenje, Slovenia. The system integrates data from Aethalometers AE33 and AE36s, a meteorological forecast, a traffic model, and BC emission factors into a dispersion model. Traffic flow simulations and on-road measurements defined emission factors for different vehicle categories (cars, light-duty vehicles, heavy-duty vehicles, and buses). The GRAL model calculated BC_LF dispersion, and the ALADIN model provided meteorological forecasts. The methodology was validated with a year-long dataset, demonstrating its potential to enhance urban planning and pollution control.

The study investigates the impacts of air pollution in Almaty, the biggest city of Kazakhstan, on the surrounding mountain areas, including glaciers. For this, the WRF-CHIMERE model was evaluated using meteorological observations and BC measurements. Results indicated that the BC vertical profiles show that although the concentrations in Almaty are lower in summer compared to winter periods, the BC from the city is more effectively transported to the mountain tops. Additionally, model runs were conducted to quantify the impact of reduced black carbon emissions on the overall mountain circulation regime.