The warning, issued by Environment Canada Thursday morning, covers Peterborough City, Lakefield and southern Peterborough County. Forecasters say air quality could improve later Thursday in some areas, but conditions may deteriorate again late Friday or Saturday.
Environment Canada says heavy wildfire smoke can affect everyone's health, regardless of age or existing health conditions. Residents are encouraged to limit time outdoors and consider rescheduling or cancelling outdoor sports, activities and events while the warning remains in effect.
Exposure to wildfire smoke can cause eye, nose and throat irritation, headaches and a mild cough. More serious symptoms, including wheezing, chest pain or a severe cough, require immediate medical attention.
People at greater risk, including older adults, pregnant people, infants and young children, those with chronic health conditions and people who work outdoors, should avoid strenuous outdoor activity and seek medical attention if they develop symptoms.
Residents are encouraged to keep windows and doors closed as much as possible to reduce smoke indoors. However, if indoor temperatures become dangerously hot, staying cool should take priority.
Anyone who must spend time outside should limit their exposure as much as possible. A properly fitted respirator, such as a NIOSH-certified N95 mask or equivalent, can help reduce exposure to fine smoke particles, though it does not eliminate all health risks.
