At these energies they would have to shut down in fog/rain. A single raindrop or snowflake could deflect enough light to potentially blind someone, or at least

At these energies they would have to shut down in fog/rain. A single raindrop or snowflake could deflect enough light to potentially blind someone, or at least give them a permanent blind spot on their retina. A trillion raindrops passing through the beam would be statistically very dangerous for anyone, everyone, nearby.