Smoke, Snow, fog, and certain materials which include glass and silicon are clear, when imaging in SWIR. That means the atmospheric influence of fog and smoke disappears during the shortwave infrared (SWIR) spectrum. Whilst capturing photographs from the SWIR lacks the color written content on the noticeable region, SWIR visuals https://www.mindvision.ltd/Special-Camera/Short-wave-Infrared-Camera.html