(USAToday) - There’s enough wildfire activity in California and Nevada to blanket much of both states with a layer of smoke in the coming days.

In California alone more than 140,000 acres are burning in large, wildland fires throughout the state. A fire in rough terrain near Reno is also contributing to smoke in northern Nevada.

In just the past two days, fires in California’s wine country are thought to have produced as much small particulate matter as all the vehicles in the state produce in a year.

“It’s a lot,” said Sean Raffuse, an air-quality analyst at the Crocker Nuclear Laboratory at University of California in Davis.

Although the early estimates are rough, Raffuse said the fires in the wine country have probably produced about 10,000 tons of PM 2.5, an air pollutant that’s the main cause of haze in the United States.