Kaarle Hämeri
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View article: Evaluation of an automatic algorithm for fitting the particle number size distributions
Evaluation of an automatic algorithm for fitting the particle number size distributions Open
The multi log-normal distribution function is widely in use to parameterize the aerosol particle size distributions. The main purpose of such a parameterization is to quantitatively describe size distributions and to allow straightforward …
View article: On the existence of neutral atmospheric clusters
On the existence of neutral atmospheric clusters Open
A recent hypothesis on the existence of neutral thermodynamically stable clusters is thoroughly investigated both experimentally and theoretically. Altogether, three different methods are utilized. First, the concentrations and size distri…
View article: Fingerprints of the urban particle number size distribution in Helsinki, Finland : Local versus regional characteristics
Fingerprints of the urban particle number size distribution in Helsinki, Finland : Local versus regional characteristics Open
View article: Long-term indoor-outdoor aerosol measurement in Helsinki, Finland
Long-term indoor-outdoor aerosol measurement in Helsinki, Finland Open
Total aerosol number concentration measurements were carried out with a condensation particle counter in a Helsinki suburban area throughout the period from 1 November 1999 to 30 June 2000. The variation of the aerosol concentration was in…
View article: Measurements of humidified particle number size distributions in a Finnish boreal forest : derivation of hygroscopic particle growth factors
Measurements of humidified particle number size distributions in a Finnish boreal forest : derivation of hygroscopic particle growth factors Open
View article: Monitoring of black carbon and size-segregated particle number concentrations at 9-m and 65-m distances from a major road in Helsinki
Monitoring of black carbon and size-segregated particle number concentrations at 9-m and 65-m distances from a major road in Helsinki Open
In February and August 2003, black carbon (BC) and size-segregated particle number concentrations were monitored simultaneously at 9-m and 65-m distances from a major road in Helsinki, Finland, using aethalometers and electrical low-pressu…
View article: Finnish Centre of Excellence in Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Climate Change : summary and outlook
Finnish Centre of Excellence in Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Climate Change : summary and outlook Open
markku Kulmala1)*, hanna K. lappalainen1)2), Jaana Back1)3), ari laaksonen2)4), eero nikinmaa3), marja-liisa riekkola5), timo vesala1), Yrjo viisanen2), tuula aalto2), michael Boy1), miikka Dal maso6), mikael ehn1), hannele hakola2), Pertt…
View article: Biogenic aerosol formation in the boreal forest
Biogenic aerosol formation in the boreal forest Open
Aerosol formation and subsequent particle growth in the ambient air have been frequently observed at the boreal forest site (SMEAR II station), southern Finland. The EU funded project BIOFOR (Biogenic aerosol formation in the boreal forest…
View article: Design and performance characteristics of a condensation particle counter UF-02proto
Design and performance characteristics of a condensation particle counter UF-02proto Open
In this paper we present a design of a new swirling flow condensation particle counter UF-02proto, which has a continuous sampling flow. The performance and characteristics of the instrument were investigated. We studied experimentally the…
View article: Airborne and deposited radioactivity from the Chernobyl accident : a review of investigations in Finland
Airborne and deposited radioactivity from the Chernobyl accident : a review of investigations in Finland Open
The Chernobyl nuclear accident happened in the former Soviet Union on 26 April 1986. The accident destroyed one of the RBMK-1000 type reactors and released significant radioactive contamination into the environment. At first the emissions …
View article: Measurements of fine and ultrafine particles in Helsinki: connection between outdoor and indoor air quality
Measurements of fine and ultrafine particles in Helsinki: connection between outdoor and indoor air quality Open
In this paper, we present aerosol number concentration and number size distribution measurements in the urban area of Helsinki, Finland. The outdoor air measurements were performed over several years between 1999 and 2003 giving a rather g…
View article: Evaluating the Theoretical Background of STOFFENMANAGER® and the Advanced REACH Tool
Evaluating the Theoretical Background of STOFFENMANAGER® and the Advanced REACH Tool Open
STOFFENMANAGER® and the Advanced REACH Tool (ART) are recommended tools by the European Chemical Agency for regulatory chemical safety assessment. The models are widely used and accepted within the scientific community. STOFFENMANAGER® alo…
View article: Technical control of nanoparticle emissions from desktop 3D printing
Technical control of nanoparticle emissions from desktop 3D printing Open
Material extrusion (ME) desktop 3D printing is known to strongly emit nanoparticles (NP), and the need for risk management has been recognized widely. Four different engineering control measures were studied in real-life office conditions …
View article: Source specific exposure and risk assessment for indoor aerosols
Source specific exposure and risk assessment for indoor aerosols Open
View article: Source Specific Exposure and Risk Assessment for Indoor Aerosols
Source Specific Exposure and Risk Assessment for Indoor Aerosols Open
Poor air quality is a leading contributor to the global disease burden and total number of deaths worldwide. Humans spend most of their time in built environments where the majority of the inhalation exposure occurs. Indoor Air Quality (IA…
View article: Aerosol particles (0.3–10 μm) inside an educational workshop−Emission rate and inhaled deposited dose
Aerosol particles (0.3–10 μm) inside an educational workshop−Emission rate and inhaled deposited dose Open
View article: Crawling-induced floor dust resuspension affects the microbiota of the infant breathing zone
Crawling-induced floor dust resuspension affects the microbiota of the infant breathing zone Open
The microbiota in the infant breathing zone differ in absolute quantitative and compositional terms from that of the adult breathing zone and of floor dust. Crawling induces resuspension of floor dust from carpeted flooring, creating a con…
View article: Additional file 1: Table S1. of Crawling-induced floor dust resuspension affects the microbiota of the infant breathing zone
Additional file 1: Table S1. of Crawling-induced floor dust resuspension affects the microbiota of the infant breathing zone Open
QIIME mapping file. Table S2. Details on qPCR assays included in this study. Table S3. Microbial concentrations as determined with qPCR in 17 carpets used in the chamber experiments, expressed as loads (cell equivalents (CE) per square met…
View article: Workplace Measurements of Ultrafine Particles—A Literature Review
Workplace Measurements of Ultrafine Particles—A Literature Review Open
Workers are exposed to ultrafine particles (UFP) in a number of occupations. In order to summarize the current knowledge regarding occupational exposure to UFP (excluding engineered nanoparticles), we gathered information on UFP concentrat…
View article: Characterization of Emissions from a Desktop 3D Printer
Characterization of Emissions from a Desktop 3D Printer Open
Summary 3D printers are currently widely available and very popular among the general public. However, the use of these devices may pose health risks to users, attributable to air‐quality issues arising from gaseous and particulate emissio…
View article: First measurements of the number size distribution of 1–2 nm aerosol particles released from manufacturing processes in a cleanroom environment
First measurements of the number size distribution of 1–2 nm aerosol particles released from manufacturing processes in a cleanroom environment Open
This study was conducted to observe a potential formation and/or release of aerosol particles related to manufacturing processes inside a cleanroom. We introduce a novel technique to monitor airborne sub 2nm particles in the cleanroom and …
View article: Notably improved inversion of differential mobility particle sizer data obtained under conditions of fluctuating particle number concentrations
Notably improved inversion of differential mobility particle sizer data obtained under conditions of fluctuating particle number concentrations Open
The differential mobility particle sizer (DMPS) is designed for measurements of particle number size distributions. It performs a number of measurements while scanning over different particle sizes. A standard assumption in the data-proces…
View article: Process-generated nanoparticles from ceramic tile sintering: Emissions, exposure and environmental release
Process-generated nanoparticles from ceramic tile sintering: Emissions, exposure and environmental release Open
The ceramic industry is an industrial sector in need of significant process changes, which may benefit from innovative technologies such as laser sintering of ceramic tiles. Such innovations result in a considerable research gap within exp…
View article: Variability of air ion concentrations in urban Paris
Variability of air ion concentrations in urban Paris Open
Air ion concentrations influence new particle formation and consequently the global aerosol as potential cloud condensation nuclei. We aimed to evaluate air ion concentrations and characteristics of new particle formation events (NPF) in t…
View article: Notably improved inversion of Differential Mobility Particle Sizer data obtained under conditions of fluctuating particle number concentrations
Notably improved inversion of Differential Mobility Particle Sizer data obtained under conditions of fluctuating particle number concentrations Open
The Differential Mobility Particle Sizer (DMPS) is designed for measurements of particle number size distributions. It performs a number of measurements while scanning over different particle sizes. A standard assumption in the data proces…
View article: Variability of air ion concentrations in urban Paris
Variability of air ion concentrations in urban Paris Open
Air ion concentrations influence new particle formation and consequently the global aerosol an cloud condensation nuclei loads. We aimed to evaluate air ion concentrations and characteristics of new particle formation events (NPF) in the m…
View article: Exposure to Airborne Particles and Volatile Organic Compounds from Polyurethane Molding, Spray Painting, Lacquering, and Gluing in a Workshop
Exposure to Airborne Particles and Volatile Organic Compounds from Polyurethane Molding, Spray Painting, Lacquering, and Gluing in a Workshop Open
Due to the health risk related to occupational air pollution exposure, we assessed concentrations and identified sources of particles and volatile organic compounds (VOCs) in a handcraft workshop producing fishing lures. The work processes…