High temperatures, increasing smog, and brush fires. All dangerous traits that are normal for Utah summers. But this year, they're all here three weeks early.

Capt. Bill Brass/Salt Lake County Fire Dept.: "WE'RE SEEING TEMPERATURES RIGHT NOW THAT WE DON'T NORMALLY SEE 'TIL MID JULY, SO IT'S REALLY GOT US CONCERNED."

It's just the beginning of June, and already, we're sweltering in temperatures well up into the 90's. And experts say that means lots of trouble may be on the way. News Specialist Stacey Butler has details.

It's back---settling in like an unwelcomed guest-- the familiar haze has officials at the Division of Air Quality issuing a voluntary no drive day from Davis to Utah Counties.

Experts warn the ozone levels are soaring. Record-breaking temperatures are making levels the highest they've ever been in the first week of June.

Rick Sprott/Utah Air Quality: "THIS IS VERY UNUSUAL AND A HIGH CONCERN FOR US BECAUSE WE DON'T WANT TO EXCEED THE STANDARD, IT DOESN'T BODE WELL FOR THE SUMMER."

Air Quality authorities warn against driving your car if you don't have to, and against gassing up in the heat of the day.

Toxic hydrocarbons released at the pump only add to the inversion. But that doesn't seem to phase most drivers.

Mandy Barlow/Magna: "I'M RUNNING OUT OF GAS, SO I HAVE TO GAS UP RIGHT NOW."

Experts warn not to exercise from noon to 7:00 tonight when ozone levels are at their peak. But even good habits, it seems, die hard.

Mike Grobstein/Salt Lake City: "IT'S EITHER PLAY TENNIS OR EAT A GREASY HAMBURGER. WHICH IS WORSE FOR YOU? BAD AIR OR EATING BAD FOOD AT LUNCH?"

Most seem to be revelling in the heat. Swimming pools are packed and sprinklers are a hot commodity.

Summer is a time to throw caution to the wind. But that's exactly what has the county fire captain concerned. 90 plus temperatures are here three weeks early, and all that rain this spring means tall and plentiful grasses now.

Capt. Bill Brass/Salt Lake County Fire Dept.: "AS IT STAYS WARM LIKE THIS THE FUELS AROUND US EVEN THOUGH THEY'RE GREEN IT'S DECEIVING, BECAUSE THEY'RE DRYING OUT EVERY DAY AND CONDITIONS ARE RIPE FOR A FAIRLY SIGNIFICANT FIRE."