National Air Quality Awareness Week in USA
National Air Quality Awareness Week in USA is held on May 3. Starts on the first Monday in May. This event in the first decade of the month May is annual. 
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The National Weather Service (NWS), the U.S. Environmental Protection Agency (EPA), and the U.S. Centers for Disease Control and Prevention urge Americans to be aware of “What’s your Air Quality IQ?” during Air Quality Awareness Week.
Similar holidays and events, festivals and interesting facts
Baby Day on May 2 (is the first ever statewide celebration of the first three years, when early experiences shape livelong potential);
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World Day of Bullying Prevention on May 2
Mental Health Week in Canada on May 3 (Held in the first full week of May);
Sun Awareness Week in Canada on May 3 (Held from the first Monday in May);
Garbage Day in Japan on May 3 (Gomi No Hi);
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