"High Pollution Advisory" or "HPA" means the highest concentration of pollution may exceed the federal health standard.
Active children, adults and people with lung disease such as asthma should reduce prolonged or heavy outdoor exertion. Maricopa County employers enlisted in the Travel Reduction Program are asked to activate their HPA plans on high pollution advisory days.
Ozone: Ground level ozone is formed by a chemical reaction that needs heat from sunlight, nitrogen oxides and VOCs to form
It started days ago
HABOOBS ANYONE OVERWHELMING PHOENIX
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