A DOAS study on the origin of nitrous acid at urban and non-urban sites
Measurements have been performed to study the origin of the tropospheric nighttime concentration of HNO(2). The experiments were carried out at 3 locations with different levels of pollution by using a commercial differential optical absorption spectroscopy (DOAS) and a point sampling analyser. HNO(2) formation is clearly indicated by the nighttime increase of the HNO(2)/NO(x) ratio. Correlation studies suggest the participation of the aerosol surface in the heterogeneous formation in the less polluted areas. In Milan the measured HNO(2) concentrations are considered to be influenced by the nighttime boundary layer and the heterogeneous formation on permanent surfaces like buildings.
Bibliographic Reference: Article: Atmospheric Environment, Vol. 30 (1996) pp. 175-180
Record Number: 199710539 / Last updated on: 1997-05-09
Original language: en
Available languages: en