(LOS ALAMOS, N.M.) -- The wildfire that surrounds the nuclear lab in Los Alamos, New Mexico, has grown to at least 61,000 acres amid mounting concerns about what might be in the smoke that's visible from space.
Such fear has prompted fire crews to set their own fires along the perimeter of the lab. So far, the strategy is working. The first air samples show lots of smoke, but no signs of elevated radiation.
"Those results show that what we see in this fire is exactly what we see in any fire across New Mexico," said Charles McMillan, the lab's director.
Environmental officials aren't taking any chances. The Environmental Protection Agency is bringing in dozens of air monitors all around the state, along with a special airplane that takes instant radiation samples. So far, officials have not been able to find anything amiss.
"Our facilities and nuclear material are protected and safe," McMillan told ABC News.
Some observers are worried not just about the barrels of nuclear waste stored at the lab, but also what's in the canyons that surround the sprawling complex. Nuclear tests were performed in the canyons dating back to the 1940s.
"The trees have grown up during that time frame and the soil could be contaminated," said Rita Bates of the New Mexico Environment Department. "If it gets heated and that stuff goes airborne, then we are concerned about that."
The canyons were a dumping ground for radioactive materials decades ago, but are now open to the public and are considered safe.
Still, one graduate student armed with a Geiger counter took to YouTube to show there was no shortage of metal or radioactivity.
Copyright 2011 ABC News Radio