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Heat/Ozone Guidelines

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Heat/Ozone
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girl on swingDuring the hot days of summer, early fall, and late spring there are frequent ozone alerts. There will be no outside activity if the temperature is 95 degrees or greater, or when under Heat Alert, Red Ozone Alert, or Orange Ozone Alert.

Please provide the school with written notice if you would like your child to not go outside on days other than listed above.

If your child has asthma or a respiratory problem, please have your child use caution when going outside for recess or PE. If your child uses an inhaler, please remind them of the importance of using it before exercise. The same is true for very cold weather.

Encourage your child to bring a water bottle to take outside for recess and PE during the hottest days, to stay well hydrated. A dehydrated child will complain of a headache or stomach cramping.

The following tips are offered for all students. Additional guidelines are provided in Plano ISD's Hot Weather Guidelines for Fine Arts Students PDF.

Keeping it Cool

  • Drink fluids before, during, and after outdoor activities.
  • If you feel thirsty, drink fluids!
  • If you bring lunch, pack a "Gatorade-type" drink. Sugars decrease the absorption of water by the body. Wear loose-fitting, lightweight, light-colored clothing.

Block the Sun

  • Wear wide-brimmed hats while in the sun.
  • Use a sunscreen with an SPF 15 or greater.
  • Stay inside when possible.
  • If shortness of breath occurs during vigorous activity, stop the activity and rest in a cooler place.
  • Use a buddy system in high-heat activities.

Weather Information


Heat Index - Heat Index (HI) or “apparent temperature” is an accurate measure of how hot it really feels when the relative humidity is added to the actual air temperature. Since heat index values were devised for shady, light wind conditions, exposure to full sun can increase HI values by up to 15 degrees.

Ozone – The “ozone season” runs from May 1 through October 31. Ozone alerts are issued as an “ozone watch”, usually the day before. If conditions actually reach hazardous levels at one of the many monitoring stations around the metroplex, an “ozone warning” is issued for that area. Unless an orange or red “warning” is issued for Collin County, the health of our students is not compromised.

The Texas Natural Resources Conservation Commission Opens new window or TNRCC has an excellent website for monitoring the above conditions.