The NO2 concentration was measured according to Palmes’ principle (Palmes et al., 1976): a triethanolamine-aceton mixture was applied to stainless steel meshes which were subsequently air-dried for ten minutes
The NO2 concentration wasmeasured according to Palmes’ principle (Palmes et al., 1976): atriethanolamine-aceton mixture was applied to stainless steelmeshes which were subsequently air-dried for ten minutes