We present a comparison between satellite-based TROPOMI (TROPOspheric Monitoring
Instrument) NO 2 products and ground-based observations in Helsinki (Finland). TROPOMI …

The measures taken to contain the spread of COVID-19 in 2020 included restrictions of
people's mobility and reductions in economic activities. These drastic changes in daily life …

In this paper we present recent achievements on develo** and testing a tool to detect the
composition of ambient ions in the mass/charge range up to 2000 Th. The instrument is an …

Ultrafine particles (UFP) are suspected of having significant impacts on health. However,
there have only been a limited number of studies on sources of UFP compared to larger …

This paper presents the development of air quality low-cost sensors (LCS) with improved
accuracy features. The LCS features integrate machine learning based calibration models …

An urban energy and water balance model is presented which uses a small number of
commonly measured meteorological variables and information about the surface cover …

The Arctic has rapidly urbanized in recent decades with 2 million people currently living in
more than a hundred cities north of 65∘ N. These cities have a harsh but sensitive climate …

Singapore has many environmental accomplishments to its credit. Accessible data on air
quality indicates that all criteria pollutants satisfy both US Environmental Protection Agency …

Urban air pollutant concentrations are highly variable both in space and time. In order to
understand these variabilities high-resolution measurements of air pollutants are needed …

Though anthropogenic impacts on boundary layer climates are expected to be large in
dense urban areas, to date very few studies of energy flux observations are available. We …