Mexico has registered nearly 8,000 wildfires this year that have scorched about 413,000 hectares (1.01 million acres), of which 59 percent were pastures, about 36 percent were undergrowth and 5 percent were trees, Environment Secretary Juan Rafael Elvira Quesada said.

Wildfires have been reported in 30 of Mexico's 32 states, with the worst damage done in Coahuila, Chihuahua, Durango, Oaxaca and Guerrero, the environment secretary said.

The largest number of fires were reported in Mexico state, the Federal District, Michoacan, Chihuahua and Puebla.

Tabasco and Baja California Sur are the only states that have not reported wildfires, Elvira Quesada said.

Brazil plans to send two Hercules aircraft equipped with firefighting gear to help put out wildfires, the environment secretary said.

This is the worst fire season in Mexico in 30 years, with the northern part of the country hit especially hard, Elvira Quesada said.

Northern Mexico has been affected by several "third-dimension fires," as experts call them, that are considered the most dangerous types of blazes, Elvira Quesada said.

Wildfires burned about 580 sq. kilometers (224 sq. miles) in the past month in the northern state of Coahuila, leading to a massive deployment of personnel and equipment for several weeks to fight the blazes, the environment secretary said.

The wildfires in Coahuila are about 90 percent to 95 percent controlled, but "that does not mean that they are extinguished," Elvira Quesada said.

The agencies involved in fighting wildfires should "not let down their guard in terms of fires," Elvira Quesada said, adding that the burning of farm fields was a problem.

Rain is expected in the fire zones, but efforts to fight existing blazes must continue, the environment secretary said.