The air in Washington reached severely polluted levels Friday morning, as smoke rolling in from Canadian wildfires sent residents indoors for a reprieve from hazy skies.

The air in the capital was rated very unhealthy, or code purple, the second-worst rating for air quality levels, next to code maroon, as of 9 a.m., according to IQAir. AccuWeather rated the air quality as “dangerous,” stating that any exposure to the air, even for a few minutes, “can lead to serious health effects on everybody.”