The GSA concentration was measured in a street canyon (traffic density: 28 000 vehicles/weekday, 10% heavy duty vehicles) using a nitrate‐based chemical‐ionization atmospheric‐pressure‐interface time‐of‐flight mass spectrometer (CI‐APi‐TOF) in May 2017. The measurement was performed in a Supersite air quality monitoring station located near the city center of Helsinki, Finland. The continuous time series of GSA concentration provides information on the diurnal variation of the GSA concentration, and the influence of solar radiation, traffic density, and other environmental variables on the GSA concentration. The NCA concentration was measured simultaneously at the same location using an Airmodus Particle Size Magnifier (PSM) and a TSI Condensation Particle Counter (CPC). In addition, also other aerosol and gas measurement devices were used in the campaign.
The highest GSA concentrations were observed during the rush hours but increased concentrations were also observed after midnight, when the traffic density was the lowest. The diurnal variation of the GSA concentration had a correlation with the diurnal variation of the NCA concentration.
|Number of pages
|Published - 2018
|MoE publication type
|10th International Aerosol Conference, IAC 2018: XTH International Aerosol Conference - Saint Louis, United States
Duration: 2 Sept 2018 → 7 Sept 2018
Conference number: 10
|10th International Aerosol Conference, IAC 2018
|2/09/18 → 7/09/18