Air: Pollution refers to the toxic gases and chemicals, such as methane and carbon monoxide, that are released into the atmosphere only to be mixed into the air we breath in and exhale out. Pollution toxins can come from vehicle and factory emissions as well as other sources.
Water: A number of toxins have been discovered in water. Everything from chlorine, bleach, ammonia and even OTC and prescription medications have been reported to be found in excess in drinking water. An extreme case of toxic water is depicted in the award winning movie Erin brockovich.
Food: Side note: toxic foods do not refer to pesticides. That comes next in the 'chemicals' category. Toxic foods can refer to food additives, highly processed or genetically modified foods and even chemical ingredients in food recipes such as food dyes (RED 40) and chemical flavorings (MSG and aspartame).
Chemicals: Chemicals that are toxic may include small amounts of very toxic things, such as pesticide residue dusted onto our freshly-picked, non-washed, non-organic produce. (Always choose organic produce when possible.) High pesticide produce items include non-organic peaches, strawberries, apples, nectarines, bell peppers, celery, cherries, lettuce, imported grapes and pears.