Wildfire smoke blowing across the Great Lakes and into the Northeast is creating significant air quality concerns in major cities like Toronto, New York, and Boston, according to AccuWeather. In some areas, the smoke can be very thick, causing the air quality to be hazardous. AccuWeather expert meteorologists are forecasting hazy conditions across many major U.S. cities, including Philadelphia, Cleveland, Chicago, Detroit, and Washington, D.C. More significant impacts are expected across Toronto and southern Canada, Wisconsin, Michigan, far eastern Minnesota, much of New York, including New York City, and New England. Children, older adults, and people with asthma, COPD, or heart disease may need to limit time outdoors when air quality reaches unhealthy levels. Strenuous outdoor activity, including sports practices, running, yard work, and outdoor labor, may be more difficult or risky during smoky conditions. Keeping windows and doors closed, running air conditioning on recirculate, and using an air purifier can help reduce indoor smoke exposure.