Low levels of diffuse smoke from Canadian wildfires will keep particulate matter concentrations in the moderate category statewide

New Jersey frequently struggles with elevated ozone levels due to its geographic location and heavy traffic volume

The state has issued an air quality alert for Thursday, June 12, particularly because of high levels of ozone, which can be dangerous for vulnerable populations, including children, seniors and people with respiratory conditions.

With the air quality index at 105 for ozone, the state Department of Environmental Protection advises that people in sensitive groups reduce their exposure by choosing lessstrenuousactivities or shortening the amount of time they are active outdoors.

The air quality index for particle pollution is moderate, at 72. Low levels of diffuse smoke from Canadian wildfires will keep particulate matter concentrations in the moderate category statewide, according to the DEP.

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Experts warn that high-ozone days can be particularly harsh, often compared to a sunburn on the lungs. The pollutant can inflame and damage airways, trigger asthma attacks, and exacerbate chronic conditions such as emphysema and bronchitis. Long-term exposure is linked to increased risk of premature death from heart or lung disease.

New Jersey frequently struggles with elevated ozone levels due to its geographic location and heavy traffic volume. The state sits downwind from coal-fired power plants in the Midwest, which emit nitrogen oxide — a key ingredient in ozone, or smog.

Compounding the issue is the state’s role as a major transit corridor: vehicle exhaust releases volatile organic compounds, another ozone precursor.

Residents with health risks are urged to limit prolonged outdoor activity, particularly during the afternoon when ozone concentrations peak. The DEP recommends checking local air quality forecasts and considering alternatives to driving, such as public transit or carpooling, to help reduce emissions.

How will air quality be on Friday?

A weak cold front will move through the region on Friday, June 13, bringing easterly winds and partly sunny skies. This will allow ozone levels to improve but remain in the moderate category throughout the state, the DEP said.

Levels of fine particulates will also remain in the moderate category as wildfire smoke lingers over the area.