The Infectious risk has shown little change over the last 12 weeks, with the most recent week close to the 12-week average..
Allergy risk activity has been trending upward over the past 12 weeks in District of Columbia, District of Columbia.
No Pollution activity has been reported over the past 12 weeks in District of Columbia, District of Columbia.
Weather risk activity has been trending downward over the past 12 weeks in District of Columbia, District of Columbia.
Last updated: August 31, 2026
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