More than 500 separate fires are burning across Russia in one of the country's hottest summers on record.
Meanwhile, wildfires around Moscow are sending more poisonous smog into the city. The poor air quality, combined with a record heat wave, has been a deadly combination.
"Our ancestors haven't observed or registered a heat like that within 1,000 years," Alexander Frolov, head Russia's weather service, said. "This phenomenon is absolutely unique."
Temperatures have reached up to 100 degrees Fahrenheit this summer, while the country's average temperature stays around 75 degrees.
One major problem is that many people in Moscow do not have air conditioning in their homes or businesses, and the city's subway system is poorly ventilated.
Health officials say the number of daily deaths in Moscow have doubled to about 700 since the fires started.
"Every night it's like we prepare for war," one local blogger said. "With open windows, it's impossible to breathe because of the burning, and with closed windows we choke in the stifling heat."
Russia has deployed thousands of soldiers to help firefighters extinguish the flames.