The Portland Air Toxics Solutions project produced a technical study that
included an analysis of available monitoring information and computer model
estimates of Portland’s expected pollutant levels in the year 2017.
These two maps contain information about levels of air toxics estimated in
the modeling study for the Portland region. Each dot is the center of a census
block where the model estimated annual concentrations of 19 pollutants for
The first map shows cumulative air toxics emissions with
darker shades indicating higher concentrations. Hovering on the dots in this map
will show for each location estimated times above the air toxics benchmark for
The second map also shows cumulative air toxics estimates
and source category estimates. Darker shades indicate higher concentrations. You
can click on a category listed on the left hand side of the page to see how it
influences concentrations. Hovering on any dot will show a percentage breakdown
of the contributions from all the listed sources.
It is possible to move around and zoom in on map features by clicking on
areas or by using the hand, select, zoom or scale tools in the lower right hand
corner of each map.
Although DEQ used the best information available to produce these maps, it is
important to understand that data displayed are estimated levels of pollutants,
not actual measured levels.