Some forms of environmental pollution or toxicity, like bacteria, can result in an infection that makes you sick, or not. Other forms, like heavy metals (common

Some forms of environmental pollution or toxicity, like bacteria, can result in an infection that makes you sick, or not. Other forms, like heavy metals (common in industrial sites), can cause serious chronic problems through prolonged or repeated exposure, but are not necessarily going to cause much harm from a single low-ish dose.