The agency says air quality is expected to reach the orange Air Quality Index (AQI) category, which is unhealthy for sensitive groups.

Elevated to critical fire danger along with worsening air quality will be the primary concern Monday afternoon. Please do not ...

Image via Shutterstock Officials are issuing a public health warning in one major American city over the quality of the air.

How is air quality across the U.S. these days? —Paul Jackson, Washington, DC. Air quality is defined as the degree to whi ...