The air quality index measures PM2.5, less than 2.5 microns particles, to determine the intensity of air pollution in cities.

The dramatically contrasting pictures below show main road Lake Avenue before and after the wildfires: These pictures show Altadena Community Church before the fire and then engulfed in flames ...

Clouds, composed of tiny water droplets or ice crystals, play a vital role in regulating Earth's climate by influencing the ...

Rows of charred homes span across Los Angeles as devastating wildfires tear through neighborhoods ... Aircraft and additional crews, some from as far as Canada and Mexico, are being deployed.