The fires affecting Moscow are concentrated in the Ryazan region, some 250 kilometers to the south. This is not the first time smog has appeared in Moscow in recent months, with local authorities advising residents to wear masks to protect themselves earlier this month.
Officials say a wildfire in Southwest Washington that ballooned Sunday, causing regional air quality issues, may have been started by a firework or firearm.
Deadly blaze that killed four people and forced evacuation of 10 villages is now close to being under control
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