(5)EPA calculates the AQI for five major air pollutants regulated by the Clean Air Act: ground-level ozone, particle pollution (also known as particulate matter), carbon monoxide, sulfur dioxide, and nitrogen dioxide. The color of the flag matches EPA's Air Quality Index (AQI): green, yellow, orange, red, and purple.epapennants.jpg
High Visibility International orange / white checkered pattern, printed heavy nylon, USA made (Annin & Co.) with open sleeve pole band, stitched at top to fit over a standard 3/4" - 1" wood dowel, wood or rebar dowel, flat wood stake, etc.airfieldsafety.jpg
(16)Solid color heavyweight nylon with 2 brass grommets, USA made. Heat safety flags are used to identify heat categories for heat injury prevention in military, agricultural and other strenuous outdoor activities under high heat and/or humidity conditions. Flags assist employers complying with suggested Department of Labor OSHA guidelines.heatstress.jpg