Chatham-Kent is under its first heat warning of the year.

Environment Canada says hot and humid air is expected bring temperatures in the low-to-mid 30s today and tomorrow, and little relief overnight with overtime lows in the 20s.

Officials say hot and humid air can also bring deteriorating air quality and can result in the Air Quality Health Index to approach the high risk category.

The risks are greater for young children, pregnant women, older adults, people with chronic illnesses and people working or exercising outdoors.

Residents are advised to schedule outdoor activities during the coolest parts of the day, never leave pets or people inside a parked vehicle.

Ways to help prevent heat-related illness:

  • Drink plenty of fluids, especially water.
  • Never leave people or pets in a parked car.
  • Seek cooler or air conditioned spaces.
  • If you are taking medication or have a health condition, ask your health care provider or pharmacist if heat increases your health risk. Be sure to follow their recommendations.
  • Check on elderly family members and neighbors frequently to make sure they are keeping cool.
  • Wear lightweight, loose fitting clothing.
  • Take cool showers or baths, or use cool, wet towels on your face, neck, and arms.
  • The use of a fan alone may not provide enough relief from the heat.
  • Avoid strenuous activities between 10 a.m. and 4 p.m. when the sun is at its hottest.
  • Avoid going out in the sun, if possible. If you are outdoors, wear sunscreen.
  • Avoid heavy meals and using your oven.
  • Keep curtains closed to block sun during the day.

Cooler air is expected to move into the area on Wednesday.