All red flag warnings for critical fire danger expired by Thursday evening, bringing relief for firefighting work on two deadly blazes in Los Angeles County.

Eaton Fire initially started 6:18 p.m. Jan. 7 in Los Angeles County. Since its discovery nine days ago, it has burned 14,117 acres. A fire crew of 3,404 has been working on site and, as of Thursday morning, they managed to contain 55% of the fire. However, investigations into the cause are ongoing.

A new air quality alert has been issued for Los Angeles County until 7 p.m. local time "due to harmful particle pollution levels from windblown dust and ash." This pollution can embed deep into the lungs and cause health problems including heart disease symptoms,