Danish air quality monitoring program annual data report 1992

摘要

The third phase of the Danish Air Quality Monitoring Program (LMPIII) was started in 1992. The program comprise an urban monitoring network with stations in three Danish cities. The program is carried out in a cooperation between the National Agency of Environmental Protection, the National environmental Research Institute (NERI), the Greater Copenhagen Air Monitoring Unit and the municipal authorities in the cities of Odense and Aalborg. The results obtained during 1992 are, as far as sufficient data have been available, summarized in form of annual statistics and trends. Beside this the maximum concentrations (episodes) and the phenomenology of nitrogen oxides and ozone are treated as special topics because a new smog warning system will be implemented from 1994 and 1992 was the first year Ozone was included in the LMP program. The annual statistics and episodes are resumed for all groups of species. The results are compared with Danish limit values and WHO guideline values for SO(sub 2), suspended particulate matter, NO(sub 2) and Pb. Ozone is a new component in the monitoring program. Phenomenological descriptions are included for ozone and NO(sub x) in order to illustrate the sources for and interaction between these species. The revised smog warming system is introduced from the beginning of 1994. The warning levels for NO(sub 2) and SO(sub 2) are unchanged in the new system. For both compounds warnings are given if the concentrations exceeds 350 (mu)g/m(sup 3) for more than three consecutive hours and no immediate decrease is expected. Beside the old compounds (NO(sub 2) and SO(sub 2)) ozone is included in the new system. With reference to the directive EEC, 1992 a warning is broadcasted if the hourly mean concentration exceeds 180 (mu)g/m(sup 3), while an alarm is send to the population if the hourly mean concentration exceeds 360 (mu)g/m(sup 3). (EG) (15 refs.)