Unhealthy air, dense fog affecting Clark County

The National Weather Service said Wednesday morning that drivers returning to work can expect stagnant air, dense fog and slick roads in some areas of Clark County.

The dense fog is especially present along Interstate 5, according to a short-term forecast. Other county communities affected by the fog include Vancouver, Battle Ground, Ridgefield, Washougal, Yacolt, and Amboy.

“Expect abrupt changes in visibilities over short distances. The fog combined with freezing temperatures may cause slick roadways on secondary or untreated roads,” the forecast says.

An air stagnation advisory for the Portland metro area is set to expire at 4 p.m. today. The weather service issued the advisory on New Year’s Day, stating surface high pressure will reside over the region for the next couple of days.

Air quality will gradually deteriorate through the afternoon due to light winds and little movement in the atmosphere, forecasters said. The weather service listed the same affected communities as those named in the forecast statement.

The conditions could negatively affect health for people with respiratory sensitivities. Those people should take necessary precautions, such as limiting time spent outside.

455 AM – A foggy, frosty and freezing this morning. Along with low visibilities in fog watch out for frosty roads as well. pic.twitter.com/pnVwI820Tz

— NWS Portland (@NWSPortland) January 2, 2019