Zürich, 11.11.2024 Ostluft and the Office for Waste, Water, Energy and Air (AWEL) / Canton Zürich / Switzerland Stampfenbachstrasse 12, 8090 Zürich https://www.ostluft.ch, https://www.zh.ch/de/umwelt-tiere/luft-strahlung/luftqualitaet-auswirkungen.html Email: geschaeftsleitung@ostluft.ch, luft@bd.zh.ch ---------------------------------------------------- This dataset is the result of an air quality monitoring campaign conducted by Ostluft between the years 2020 and 2023 in the city of Kloten, Canton of Zurich, Switzerland. OSTLUFT is the intercantonal air quality monitoring network of the cantons of Eastern Switzerland and the Principality of Liechtenstein. West of Kloten lies the airport Zürich-Kloten. The area also exhibits high levels of road trafic. Both are major sources of ultrafine particles (UFP, i.e. aerosol particles with a diameter less than 100 nm). The air quality measurements were supposed to adress the question of how much air and road traffic in Kloten impacts the abundance and dynamics of ultrafine particles (measured as UFP number concentrations). For this purpose, an air quality monitoring station measured standard air pollutants, meteorological parameters as well as aerosol number-size-distributions. The monitoring site, called "Kloten - Feld", is situated slightly less than 1 km east of the airport's runway 28. Specifically, it is located at the coordinates 2'686'370 / 1'256'639 (in the Swiss coordinate system LV95 / EPSG:2056) at an altitude of 440 m above sea level. This location is representative of the air quality in the surrounding neighbourhood. The measurement period from 29.02.2020 to 31.12.2023 covers the entire Covid-19 pandemic, which temporarily caused a significant reduction in the air traffic at the Zürich-Kloten airport. Road traffic was also affected, but less severely and for a shorter period than air traffic. By mid 2022, the traffic regime was back to something close to normal. The present dataset therefore covers both, the traffic regime under Covid-19 circumstances as well as the "normal" traffic regime. Ostluft has pepared an extended report on the results of the monitoring campaign between the years 2020 and 2023, see: https://www.ostluft.ch/fileadmin/ostluft/pdf/projekte/2024/BE_Ultrafeine_Partikel_in_Kloten_2020_bis_2023.pdf The report (in German) includes a source apportionment of local air and road traffic towards measured UFP as well as a detailed method documentation. To understand more about the applied methods, the results and their context, the reader is strongly advised to study the above mentioned report. The present dataset contains all measured UFP, air pollutant and meteorological parameters at 10-minute aggregation intervals (usually mean values) in the files named "Messdaten Luftschadstoffe und Meteorologie Kloten Feld", stratified by year of measurement. These include UFP number concentrations between electrical mobility diameters of 5 and 100 nm derived from the aerosol number-size-distribution measurements. In addition, the aerosol number-size-distributions measured by SMPS are provided in the files named "Messdaten Aerosol Anzahl-Grössenverteilungen Kloten Feld", also stratified by year of measurement. The data have, to the best of our knowledge, been subjected to quality checks and calibrations as well as standard air quality monitoring procedures. However, the user is advised to apply their own additional plausibility checks. Air quality and meteorological parameters were measured at the following heights above ground level: - Gases: 4.3 m - UFP: 4.1 m - PM2.5: 4 m - eBC2.5: 4.15 m - Wind: 10.2 m The files themselves are comma-separated *.csv files formatted in UTF-8 typesetting; missing data is marked "NA". They contain the following parameters: - "Messdaten Luftschadstoffe und Meteorologie Kloten Feld": - "starttime": start time of 10 minute interval (YYYY-mm-ddTHH:MM:SS+01:00, i.e. in UTC+1) [string] - "parameter": name of measured parameter [string] - PN[5-100nm]: number concentration of UFP with electrical mobility diameter between 5 and 100 nm (derived from measured number-size-distributions) - PM2.5: gravimetric mass of particulate matter with an aerodynamic diameter less than 2.5 μm - eBC2.5: mass of equivalent black carbon in particulate matter with an aerodynamic diameter less than 2.5 μm - NO: nitrogen monoxide - NO2: nitrogen dioxide - NOx: nitrogen oxides = NO + NO2 - SO2: sulfur dioxide (SO2 has been corrected for cross-interference with NO, experimentally quantified to be linearly 0.23% for the applied instrument) - CO2: carbon dioxide - T: ambient air temperature - StrGlo: ambient global radiation - Hr: ambient air relative humidity - RainDur: rain duration - WD: wind direction - WVv: vector wind velocity - T_Trockner: UFP aerosol sample inlet air temperature (measured after dryer) - Hr_Trockner: UFP aerosol sample inlet relative humidity (measured after dryer) - "value": measurement value of parameter [float] - "unit": unit of parameter (all mass-related units are provided under standard air pressure 1013 hPa and air temperature of 20 °C) [string] - "Messdaten Aerosol Anzahl-Grössenverteilungen Kloten Feld" (10-minute averages are based on 1-minute SMPS-scans, where the actual scan-duration is 44 seconds, followed by 16 seconds purge) (for this dataset, units are not provided in a separate column in order to limit file size; instead see in brackets below): - "starttime": start time of 10 minute interval (YYYY-mm-ddTHH:MM:SS+01:00, i.e. in UTC+1) [string] - "dp": midpoint of electrical mobility diameter particle size-class (in nm) [float] - "parameter": name of measured parameter [string] - dN: total number of particles within dp size class (in #/cm3) - dN/dlogDp: normalised number concentration of particles within dp size class (in #/cm3) - "value": measurement value of parameter (number-size-distributions have been corrected for particle diffusion wall losses in the SMPS as well as the aerosol sample inlet) [float] The datasets are published with a "free" licence, meaning: - the data can be used for non-commercial purposes, - the data can be used for commercial purposes, - referencing the data source is not required, but recommended: - german: "Ostluft, 2024, Zürich, Schweiz, Ultrafeine Partikel in Kloten. - english: "Ostluft, 2024, Zurich, Switzerland, Ultrafine particles in Kloten.