Oxidized nitrogen compounds in long-range transported polluted air masses

The emissions of nitrogen oxides have increased at a relatively high rate during the 1960s and '70s while emissions of many other substances, e.g. soot and sulphur dioxide, have remined a a more or less constants level. We may also expect a further increase in the emissions of nitrogen oxides in teh next decade. Last year, data from a number of OECD countries indicated an increase in NOx emissions of about 40-60 % between 1972 and 1985. This rapid increase will probably not only lead to effects on the local scale but directly or indirectly cause effects over lage regions. In order to investigaete the long range transport and conversion of nitrogen oxides, mesurements of oxidized nitrogen compounds have been undertaken at a remote station, (Rörvik) at the Swedish west coast. The mesurements comprise NO and NO2, monitored continuously with a chemiluminiscent instrument; particle -borne nitrate on Fluoropore filters; and gaseous nitrates (HNO3) with a method based on adsorption on impregnated filters. The NO2 values obtained with the chemiluminiscent monitor will include other gaseous nitrogen compounds as well, such as PAN and HNO3. Unless otherwise specified, the NO2 value in the presentation includes these substances. Nitrogen oxide were monitored between 1976 and 1978 and gaseous nitrates mainly between June 1977 and June 1978. Partculate intrates have been monitored occasionally only during this period; most of the data on particulate nitrates are from measurements prior to 1976The emissions of nitrogen oxides have increased at a relatively high rate during the 1960s and '70s while emissions of many other substances, e.g. soot and sulphur dioxide, have remined a a more or less constants level. We may also expect a further increase in the emissions of nitrogen oxides in teh next decade. Last year, data from a number of OECD countries indicated an increase in NOx emissions of about 40-60 % between 1972 and 1985. This rapid increase will probably not only lead to effects on the local scale but directly or indirectly cause effects over lage regions. In order to investigaete the long range transport and conversion of nitrogen oxides, mesurements of oxidized nitrogen compounds have been undertaken at a remote station, (Rörvik) at the Swedish west coast. The mesurements comprise NO and NO2, monitored continuously with a chemiluminiscent instrument; particle -borne nitrate on Fluoropore filters; and gaseous nitrates (HNO3) with a method based on adsorption on impregnated filters. The NO2 values obtained with the chemiluminiscent monitor will include other gaseous nitrogen compounds as well, such as PAN and HNO3. Unless otherwise specified, the NO2 value in the presentation includes these substances. Nitrogen oxide were monitored between 1976 and 1978 and gaseous nitrates mainly between June 1977 and June 1978. Partculate intrates have been monitored occasionally only during this period; most of the data on particulate nitrates are from measurements prior to 197