Benzene and ethylene are used extensively to fulfill our modern lifestyles. While any exposure to toxins such as pesticides is undesirable, it does happen. Rain cycle washes to rivers lakes municipal drinking supplies you. Although not manufactured any longer in North America, PCBs can still be found in soils, plants, animals and humans. New uses are restricted.
Health effects are difficult to determine, because other chemicals are usually involved.
Longer term exposures have resulted in liver damage , effects on reproduction and the immune system , and occasionally teratogenic effects. No chronic health effects to humans have been associated with low-level exposure to these substances. Accidental exposures have resulted in chloracne. Most Canadians are not exposed to significant levels of dioxins and furans. Air pollutants can affect us directly when we breathe them in, or indirectly, through their effects on the environment.