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The road emission databases for the sixties were updated from
traffic flow maps for main streets in Stockholm, Solna and Sundbyberg
and main roads outside these parts. Traffic in these central parts
of Stockholm county increased with about 50 percent in the sixties.
During the sixties the growth of traffic in the rest of the county
was between 20 and 30 percent. This traffic growth was applied
to the roads in these parts.
Nitrogen dioxide concentrations are used as one indicator of air
pollution from road traffic. In the final calculations of nitrogen
dioxide only road traffic emissions were included. The contribution
from the road traffic emissions of nitrogen oxides to the concentrations
of nitrogen dioxide is shown in the figure below.
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