Dust and particulate pollution was a huge problem, and the EPA monitored air quality and vacuumed dust from the streets to prevent future problems. Still, lots of rescue workers developed respiratory problems. Some even got asbestos poisoning.
There is no doubt that heavy amounts of dust were negatively impacting New York citizens who were in contact with it. However, after 9/11, the U.S. government grounded all planes for three days. This allowed scientists an unique look into how air travel affects temperatures. What they found was that temperatures were two degrees higher than previous averages. The scientists believe that jet trails act like artificial clouds, keeping it cooler during the day and warmer at night.
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