More than a thousand Brazilian municipalities were on alert Thursday due to very low humidity – in some cases comparable to that of the Sahara desert – as the country is gripped by a historic drought that has fueled major wildfires.

Flames reached a protected forest on the outskirts of the capital Brasilia, which was enveloped in smoke for the second time in two weeks, and where it has not rained in 130 days.

The National Institute of Meteorology (Inmet) said in a report that Brasilia, as well as the southeast with its highly populated states of Sao Paulo and Minas Gerais, were among the worst affected by a “relative humidity of less than 12 percent.”

This was a “very dangerous” situation due to the “great risk of forest fires,” the government agency said.

Such low humidity also impacts residents’ health and can cause pulmonary disease or headaches.