Smoke from the wildfire in New Jersey's Wharton State Forest is being smelled in New Jersey, Pennsylvania and Delaware.

The worst air in the country on the morning of June 14 was in New Castle County because of a wildfire in New Jersey. The air quality index in Wilmington as of 9:45 a.m. was 227, which is "very unhealthy," according to AirNow. A monitor in Newark was at 240.

New Jersey's Burlington County wildfire grows to 3,250 acres, 30% contained, causing smoke to trigger 'Code Orange' air quality alerts in Philadelphia.

Fire engines, helicopters and ground crews were being used to try to contain the blaze, which has been dubbed the Mines Sprung Wildfire.

A wildfire in a New Jersey state forest in Burlington County grew to 400 acres Friday afternoon and forced the evacuation of a juvenile justice public school and a campground, fire officials said.

The thick, white smoky haze that increased north and east of the city was primarily the result of wildland fires in New Jersey and Canada.

If you're seeing smoke in the Harford County area, officials say don't worry. The smoke is due to the wildfires in New Jersey and Canada.

Forecasters warn that hazy, grayish-blue skies could persist for many weeks as fires continue to burn, though most smoke will remain high in the atmosphere.