The fires have destroyed dozens of buildings, damaged or destroyed more than 2,000 homes, and left thousands without power.
Now, the National Oceanic and Atmospheric Administration (NOAA) has identified the cause of the flames as high temperatures and poor ventilation.
A spokesman for the agency, Dan Stapleton, said the agency’s own testing showed that the fire started at a ventilation system, which was too small to prevent the heat from reaching the coal.
The system was designed to control fire.
“There is no evidence of a failure of ventilation at the site,” he said.
But a review by The Wall St. Journal, which has been following the fires for years, found that the problem is far more widespread.
A review by NOAA found that firefighting experts had underestimated the number of fires in the state because of a lack of data on the extent of the damage.
NOAA’s report found that only 3 percent of the fires are being fought and the remaining 97 percent are not being extinguished.
The agency also found that many of the smaller fires, which burn at the edges of the coal ash pile, do not have adequate cooling systems.
“Our data indicates that fires at these sites are burning with less than the required cooling capacity,” NOAA’s John Stoddard said in a statement.
“We have not found any significant differences in fire behavior between these types of fires.”
According to NOAA’s analysis, a small portion of the 1,965 fires that have burned in Virginia since the start of the state’s wildfires season in January are being extinguished because of poor ventilation systems.
According to the analysis, the state is only using about two-thirds of its ventilation capacity, which is more than 20 percent of its total capacity.
The agency also pointed out that the vast majority of the large fires are not currently burning at the edge of the ash pile.
There are a number of factors contributing to the lack of ventilation.
The EPA has not yet released the final cause of those fires.
In recent months, the agency has identified more than 5,000 sites that were not properly ventilated, according to the report.
In addition, the report found several large coal mines that are not fully ventilated in areas where fires have spread, and some large coal miners who have not yet reached their end of the year shutdown.
The EPA’s study also found evidence of the impact of poor firefighting in other parts of the country.
In New York City, the firefighting equipment that had not been properly ventilated has been leaking.
And in Arizona, the water supply at one of the largest coal mines in the region has not been treated, the study found.
According, the EPA’s findings were based on information from the National Interagency Fire Center.
The center was created by the U.S. Department of Commerce to track fire activity and provide a report to Congress on the state of the nation’s forests.
At the time of the report’s release, the coal industry’s main concern was that the fires would not have been contained if the fires had been less extensive.
“The agency is confident that it is well within its authority to identify the cause and to recommend changes that are appropriate to protect public health and safety,” Stoddart said.
“However, the issue of ventilation needs to be a priority, and we are still assessing the extent to which the agency can make those recommendations and provide those recommendations in a timely fashion.”
In an emailed statement, the American Coal Association said, “We believe this is an appropriate time for the EPA to provide additional information about the cause.”