That’s because wildfire smoke contains fine particulates, known as PM2.5, which are one-seventieth the width of a single ...

The National Weather Service Tucson has issued an air quality alert in effect until midnight for the Tucson Metro Area.

Good (Green): 0-50 AQI means there is little or no health risk associated with air quality. Moderate (Yellow): 51-100 AQI ...

As for the 8x22mm cartridge, it’s a rimless bottleneck cartridge with a diameter of 0.320 inch, generating a muzzle velocity ...