Publications by authors named "J P Niemi"

Carbonaceous aerosols (CA), composed of black carbon (BC) and organic matter (OM), significantly impact the climate. Light absorption properties of CA, particularly of BC and brown carbon (BrC), are crucial due to their contribution to global and regional warming. We present the absorption properties of BC (b) and BrC (b) inferred using Aethalometer data from 44 European sites covering different environments (traffic (TR), urban (UB), suburban (SUB), regional background (RB) and mountain (M)).

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The microbiome plays a crucial role in the calves' early stages of life. Several management practices can be considered to enhance the development and composition of the microbiome in calves. However, their social acceptance is largely unknown.

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In recent years, integrated veterinary herd health management (VHHM), improving animal health, welfare, food safety, public health, farm management, and economics, has become ever-more important in the European Union due to structural and regulatory advancements. A mixed-methods study analyzed the current state and gaps in VHHM education and training across Europe. Data from 41 European veterinary institutions showed that 83% ( = 34/41) offered VHHM education, either as standalone courses and/or integrated into other subjects.

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There is a body of evidence that ultrafine particles (UFP, those with diameters ≤ 100 nm) might have significant impacts on health. Accordingly, identifying sources of UFP is essential to develop abatement policies. This study focuses on urban Europe, and aims at identifying sources and quantifying their contributions to particle number size distribution (PNSD) using receptor modelling (Positive Matrix Factorization, PMF), and evaluating long-term trends of these source contributions using the non-parametric Theil-Sen's method.

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Article Synopsis
  • Brown carbon (BrC) is a type of organic aerosol that absorbs light in the UV-Vis spectrum, influencing climate, but its full effects are not well understood due to limited knowledge on its chemistry and atmospheric behavior over time.
  • This study focused on measuring BrC in particulate matter from winter emissions in Helsinki, specifically in areas influenced by wood combustion, using advanced techniques to analyze its sources, chemical composition, and the extent of light absorption.
  • Findings indicated that BrC significantly contributed to light absorption, especially in residential areas, with biomass burning being the primary source, while the research also highlighted variances in absorption characteristics and the uncertainties related to measuring these properties.
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