KFL&A Public Health has adopted a series of extreme heat thresholds to inform KFL&A area residents, health professionals, and community service providers on the measures they can take to reduce the health effects of hot, humid, and smoggy weather. Between May 1 and September 30, KFL&A Public Health monitors forecasted weather conditions and issues Heat Advisories when a hot or humid air mass is forecast and heat-related health effects may occur. People at the highest risk of health problems from a hot, humid, or smoggy weather include the elderly, infants (less than 1 year), people who have chronic physical and mental illnesses, and some people on certain medications.