Always consider the wind, they like to use that to spray toxins knowing over time, they will eventually get you or contaminate your environment. That is how I got blinded in one eye with a reoccurring infection from a bioweapon that keeps my vision clouded and distorted, ranging from a level of discomfort to full out excruciating agony. You will see signs of these tactics when you see areas that have things like small windmills, dangling strings, constant mylar balloons out, anything that can give a visual cue when they detect you in an area.