During extreme weather conditions, district officials will assess the weather conditions and the impact of that weather on the safety of students and staff. 

Air Quality: The US Environmental Protection Agency (EPA) has provided a scale called the Air Quality Index (AQI) for rating air quality. The AQI scale is based on the National Ambient Air Quality Standards. 

Air Quality/ Temperature Index	Appropriate Health Considerations/Actions
GOOD 0-50	Enjoy the outdoors.
MODERATE 51-100	Unusually sensitive people should limit outdoor exertion.
UNHEALTHY FOR SENSITIVE GROUPS 101-150	Active children and adults and people with Respiratory Disease, such as ASTHMA, should limit prolonged outdoor    exertion. No more than 15 minutes of outdoor activity during the school day.
UNHEALTHY 151-200	Sensitive groups and all others, especially children, should limit outdoor exertion to no more than 10 minutes of outdoor activity during the school day.
VERY UNHEALTHY 201-300	Sensitive groups should avoid all outdoor exertion; all others, especially children should limit outdoor exertion. No outside activity should be planned for Coppell ISD students or staff.
HAZARDOUS 300+	Everyone should avoid all outdoor activity.
HEAT ADVISORY: Temp. above 98 degrees	P.E. classes must stay inside and recess must be 15 minutes or less
COLD ADVISORY: Temp or wind chill around freezing (32 degrees)	Keep students away from icy ground. If the temperature or wind chill falls into the 30s, outside recess should be limited to 15 minutes. Below freezing temperatures warrant inside recess.