Hamilton has called a heat advisory for Tuesday.

The city's heat response system issues a heat advisory if the humidex reading is expected to be 40 or greater for one day.

If the same condition lasts more than one day, the city will issue a heat warning.

The combination of temperature and humidity can impair the cooling effect of sweating and increase the risk of heat-related illness.

People who are at greater risk include the elderly, infants and pre-school children, as well as those who have chronic illnesses, mobility problems, those who are taking certain medications and working vigorously outdoors.

The city recommends the following to reduce the risk of heat-related illness.

Drink plenty of water. Avoid drinking alcoholic and caffeinated beverages on hot days.

Go to an air-conditioned place. Visit a cool place such as a mall, public recreation centres, public libraries, and other city-run air-conditioned facilities, etc.

Dress to protect from the heat. Wear lightweight, loose-fitting, light coloured clothing. Wear a hat or take an umbrella to keep your head cool and don’t forget sunscreen.

Take it easy. Limit physical activities (walking, running, gardening, etc.) during the day. If rescheduling activities to dawn or dusk when it may be cooler, protect yourself with insect repellent as mosquitoes are more active at such times. Check labels to apply.

Cool off. Take a cool bath or shower.

Keep your living space cool. Close your blinds or curtains. Open windows to let air circulate when using a fan.

Never leave children or pets alone in closed vehicles. Temperatures in a car can become life-threatening within minutes.

Check on your neighbours and family.

Signs of heat exhaustion include heavy sweating, weakness, weak pulse, fainting and vomiting, as well as cold, pale and clammy skin.

If experiencing symptoms, seek help right away and call 911 if needed.

For tips on coping with the heat and places where to cool off, the public can contact 905-546-CITY (2489) Monday to Friday 8:30 a.m. to 4:30 p.m. or go to www.hamilton.ca/heat. Heat information online is available in several accessible formats and in 13 languages.