The skies in Maryland turned hazy Wednesday morning because of Canadian wildfire smoke, according to the state Department of the Environment.

But unlike last summer, there’s not a broad concern for ambient air quality.

“Concentrations [of smoke particles] do not warrant air quality alerts for fine particles, but the smoke will likely be perceptible,” the state’s air quality forecast said as of 10:30 a.m. on Wednesday.

The air quality is graded as “yellow,” according to AirNow.gov, meaning the air quality is considered acceptable and the level of concern is only “moderate.”

That means only the most at-risk groups, or people who are especially sensitive to particulate matter pollution, should exercise caution. Particulate matter pollution has been linked to a variety of cardiovascular health issues, including nonfatal heart attacks, aggravated asthma and decreased lung function, according to the Environmental Protection Agency. That’s because the material in the air is so small that it can enter the bloodstream.

Last year, Baltimore spent several days under “unhealthy,” “very unhealthy” and even “hazardous” levels of concern, as particulate matter from Canadian wildfires lingered over the city. The skies in June last year took on an unusual reddish hue across the Northeast as smoke particles scattered sunlight.

City officials opened up indoor locations for people to seek shelter and some air travel was disrupted because of the thick layer of smoke reducing visibility.

Lingering smoke, higher temperatures and lighter winds will likely create a “moderate” air quality index on Thursday, and the residual smoke will begin to leave the region Friday, the Maryland Department of the Environment said.

Outside of the haze from the Canadian wildfires, the weather in Baltimore is forecast to be sunny with a high of around 85 degrees on Wednesday, according to the National Weather Service. Thursday and Friday are also forecast to be sunny, with a chance of showers and storms Friday night and into the weekend.