"Harmful contaminants" refers to substances or materials that can cause harm or damage to something or someone. These contaminants can be dangerous or toxic and can contaminate something by making it impure or unsafe. Full definition
While the tap water you drink may look clean, it may contain harmful contaminants like lead, pesticides and industrial pollutants. (mompoweredmedia.com)
Oil and filter changes are a vital component of a vehicle maintenance plan, as these changes help keep harmful contaminants such as dirt and debris out of your engine's interior components. (Southshorechryslerdodgejeepram.com)
Construction efforts set about to avoid introducing harmful contaminants into the space that was forming. (living-future.org)