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There were many metals used in the World Trade Center. EPA closely monitored the air at the site itself and in the surrounding
area to determine the impact of the WTC collapse, and later cleanup efforts.
The following summarizes the results of monitoring for metals in air. Monitoring ended in May 2002.
EPA detected twenty-two metals: antimony, arsenic, beryllium, cadmium, chromium, cobalt, lead, manganese, nickel,
selenium, aluminum, barium, calcium, copper, iron, magnesium, potassium, silver, sodium, thallium, vanadium, and zinc.
The first ten of these metals are hazardous air pollutants (HAPs), also called toxic air pollutants, under the Clean Air Act.
Although we detected these metals, they were detected infrequently. When detected they were mostly at low concentrations.
The infrequent detections above the screening levels for metals in ambient air mean they did not pose significant risk of
long-term health problems to the general public.
Additional details are available.
This map shows the locations of EPA metals monitoring stations in Manhattan. Select a station to view
metals monitoring data.
Select a location to view data
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