> "Reaching the 50-meter scale for air waveguides literally blazes the path for even longer waveguides and many applications," and mentions 20% efficiency gain

> "Reaching the 50-meter scale for air waveguides literally blazes the path for even longer waveguides and many applications," and mentions 20% efficiency gain for light in the waveguide (if i didn't misunderstand). I wonder how sensitive to pollutants this will be. Smoke screens to stop laser artillery?