The relative proportions of these two aerosol types, the BC-to-OA ratio, determine the colour of the smoke, which can range from black through shades of brown and grey, to white as the ratio ...

If there are more brush fires, here's an explainer from the Bonita Springs Fire Control and Rescue District's Facebook page on what the different colors of smoke mean: According to the Facebook ...

Smoke containing fine particulates was reducing the air quality, evident as a brown-gray haze mixed with fog Friday morning in Denver, obscuring views of downtown buildings and mountains to the ...