Air Quality & Wildfire News — July 28, 2026

Two heat stories are running at once today: a dome of high pressure building across the American Southwest, and a fourth heat wave arriving over fires in France and Spain that are already the worst on record. Here's what was reported.

A heat dome and Canadian smoke meet over the US

Dangerously hot conditions are moving west across the United States this week, with a heat dome over the Texas Panhandle pushing into the Southwest and highs of 100–111 degrees from the Southwest into Oklahoma and Texas, AccuWeather senior meteorologist Chad Merrill told USA TODAY. By Thursday, lower-100s heat is expected to spread through California's San Joaquin and Sacramento valleys, with 110–120 degrees in the southern California deserts.

That heat, combined with dry air, raises wildfire risk. Merrill said the risk will be very high through the weekend east of the Cascades in Washington and Oregon and north into British Columbia, where several large wildfires are already burning, as well as in the Sierras, the Great Basin, southern California's hills and mountains, and the northern Rockies. Canadian wildfire smoke is part of the same picture, creating unhealthy conditions for millions of people.

France evacuates 4,000 more as the heat returns

French authorities ordered nearly 4,000 more people to evacuate Tuesday from tourist sites on the Atlantic coast as returning heat threatened firefighters' fragile hold on the fire west of Bordeaux, the Associated Press reported via the Atlanta Journal-Constitution. The blaze in the Gironde region has burned an area four times the size of Paris and forced 220,000 people to leave.

Across France and Spain, roughly 330,000 people have been driven from homes and vacation sites. President Emmanuel Macron called the crisis the "toughest since the Second World War," and Prime Minister Sébastien Lecornu said 116,085 hectares — about 287,000 acres — have burned in France since January, as TIME reports.

The Gironde fire generated its own thunderstorm

The Gironde fire produced a pyrocumulonimbus cloud — a thundercloud born from a fire's own heat — that struck the ground with lightning and started new fires, Fortune reports. France's national firefighters federation said it had never recorded one in the country before. The cloud first formed at about 6:20 p.m. Friday, two days after the blaze erupted near Saumos on July 22, weakened overnight as humidity rose, then re-formed several times.

"Imagine a campfire so large and hot that the smoke rising off it turns into a storm-like cloud," fire meteorologist Theodore M. Giannaros of the National Observatory of Athens told Fortune. The fire has burned more than 420 square kilometers (162 square miles) of forest and scrubland and damaged or destroyed more than 240 homes. Clouds like this loft smoke high into the atmosphere, which is one reason smoke from a single fire can end up far downwind.

Spain's record fire is changing how crews fight it

Spain's largest recorded wildfire has consumed 500 square kilometers (193 square miles) west of Madrid and forced 25,000 people to flee villages in the hills of Ávila, the Associated Press reports. Firefighter Javier García, who has spent two decades on the job, said the blaze has no precedent and that its ferocity is forcing crews to change tactics — prioritizing evacuations and protecting property rather than attacking flames directly.

"Now it is lives first, then homes, and after, the forest," García said. No deaths from the fires have been reported. Counting the Ávila fire, another nearby in the Madrid region, and one in eastern Castellón, 79,000 people have left their homes.

A hundred horses let loose near Biscarrosse

Staff at an equestrian center in Biscarrosse, about 40 miles southwest of Bordeaux, broke down their own fences and released horses into the streets when smoke, heat, and flames made trailer evacuation impossible, Newsweek reports. "We figured animal instinct would do the job," manager Marine Champeval told Le Monde. Most of the center's 100 horses had already been moved to safety, and she said the rest came through unharmed.

The center's storage shed, shelters, and fences are gone, and the horses cannot return yet. Remi Lassoureille, who leads forest fire efforts in Gironde, said roughly 42,000 hectares burned there in six days.

Sources

• Maps show where heat dome and wildfire smoke cover the US — USA TODAY
• France evacuates 4,000 more people as heat threatens wildfire fight across southwestern Europe — The Atlanta Journal-Constitution
• Photos Show Destruction in France and Spain From Ferocious Wildfires — TIME
• It's so hot in France that a wildfire created a never-before-seen lightning cloud that ignited even more fires — Fortune
• Firefighters say they've never seen anything like Spain's record blaze — The Associated Press
• Horses Gallop Through French Streets to Escape Wildfire Flames — Newsweek

Canairy aggregates publicly reported air-quality and wildfire news and summarizes it in plain English, with links to the original sources. This is educational information, not medical or emergency advice. In a wildfire or air-quality emergency, follow guidance from local authorities.