摘要：As a part of the EUCAARI and IS4FIRES projects, a prescribed burning experiment was conducted near the SMEAR II station in Hyytiälä, Finland, on 26 June 2009. The groundlevel concentrations of the smoke at different distances from the burn area were measured by a mobile laboratory van “Sniffer”. The maximum of the total particle number concentration, Ntot, was 2.7 ¥ 106 cm–3 at a distance of around 180 m from the burn area. The number size distribution had two modes peaking at 12–16 nm and 90–100 nm during the flaming phase, and three modes peaking at 6–10 nm, 42–70 nm, and 260–460 nm during the smouldering phase. The accumulation and coarse mode particles dominated the volume size distributions. The emission ratios were calculated for Ntot, PM2.5, CO and NOx in regard to the excess CO2 concentration. The obtained emission factors EF (number or mass per kg fuel burned) were 18.4 ¥ 1015 kg–1, 29.0 g kg–1, 52.1 g kg–1, and 2.7 g kg–1 for Ntot, PM2.5, CO and NOx, respectively.
