LAS VEGAS (AP) - A huge non-nuclear explosion expected to generate a mushroom cloud in the Nevada desert will meet state air quality regulations, officials said Wednesday.

State regulators have raised questions about pollution and hazardous materials from the planned June 2 detonation of 700 tons of an ammonium nitrate and fuel oil, an official with the Nevada Division of Environmental Protection said.

But the Nevada Test Site has a blasting permit, and state officials said they had no plan to try to block the Defense Threat Reduction Agency's experiment, dubbed "Divine Strake."

"If they are going to comply with all the state air quality regulations within their permit, they will be allowed to go ahead," said Dante Pistone, spokesman for the state air quality regulatory agency in Carson City. "We are awaiting information on the air quality parameters of the test."

Darwin Morgan, spokesman for the National Nuclear Security Administration, said the federal agency intends within the next two weeks to provide proof to the state Department of Conservation and Natural Resources that the massive blast 90 miles northwest of Las Vegas won't violate pollution emissions standards set by a June 2004 air quality permit.

"They have asked us to assure that we will be able to remain within the boundaries of our permit," Morgan said. "We fully intend to comply."

Computer models show that detonating a 900-ton ammonium nitrate and fuel oil bomb would not violate state regulations, Morgan said. By comparison, the ammonium nitrate and fuel oil bomb that destroyed the Alfred P. Murrah Federal Building in Oklahoma City in 1995 weighed 5,000 pounds, or 2.5 tons.

A Defense Threat Reduction Agency spokeswoman said detonating a 700-ton bomb will help scientists chart ground motion and shock waves in an underground limestone tunnel built in 1998 but never used for nuclear testing.

The closest underground nuclear test was conducted 1.5 miles from the Divine Strake site, said Irene Smith, spokeswoman for the agency in Fort Belvoir, Va. She said the test is expected to help design a weapon to penetrate hardened and deeply buried targets.

The explosion should not disturb surface contamination left from 100 aboveground and 828 underground nuclear weapons tests conducted at the vast test site from 1951 to 1992, Morgan said.

He said the nearest ground-zero areas of known contamination from aboveground tests are at least three miles from the Divine Strake location, in the center of the 1,375-square-mile federal reservation.