SANTA MARIA, Calif. (AP) — Rising temperatures on Wednesday posed new challenges for firefighters who have made incremental progress against a massive wildfire in central California that has injured four people as it has become the biggest blaze in the state so far this year.

More than 800 structures are being threatened by a massive wildfire burning through Los Padres National Forest in central California

The Gifford Fire, a wildfire burning in Central California that has destroyed over 83,000 acres in six days, continues to rage and is now the largest blaze in the state this year, according to Cal Fire.

A thin veil of smoke from wildfires burning in Canada is worsening air quality and putting a lid on temperatures in the D.C. area. The smoke, which has resulted in some of the world’s worst air quality in the Upper Midwest and Northeast, is only wafting through the Mid-Atlantic in limited quantities, but it’s enough to have a small impact.

Smoke from Canadian wildfires is causing air quality concerns for many Americans in the Midwest and Northeast for another day this week.  Air quality alerts were in effect Wednesday morning in parts of Minnesota,

Air quality has taken a serious hit across the United States as a twofold blow of wildfires in the West and in Canada have sent smoke pouring across large sections of the country — a problem that’s set to linger for days.