pollutant

Thân thiện

A factory smokestack releases a dark pollutant into the clear sky.

Definition

Noun: A substance or energy introduced into the environment that has undesired or harmful effects, making air, water, or soil unclean or impure. Pollutants are typically waste materials from human activities.

Usage

A "pollutant" is a count noun. It refers to a specific contaminating agent. It is commonly used with verbs like "be," "release," "emit," "reduce," and "remove." It is often modified by adjectives specifying its type or source (e.g., chemical pollutant, air pollutant, industrial pollutant).

Examples

• The factory was fined for releasing a dangerous pollutant into the river.
• Carbon monoxide is a common air pollutant produced by vehicles.
• Scientists are studying how to remove these persistent pollutants from the soil.
• Strict regulations aim to limit the amount of each pollutant.

Advanced Usage

• "Persistent organic pollutant (POP)": A toxic chemical that remains in the environment for a long time without breaking down.
  • DDT is a well-known persistent organic pollutant.
• "Criteria pollutant": In regulatory contexts, one of a group of common air pollutants with established national air quality standards.
  • Ground-level ozone is one of the six criteria pollutants.

Variants and Related Words

• Pollute (verb): To make air, water, or soil dirty or harmful.
  • The spill polluted the coastline.
• Pollution (noun): The presence of pollutants in the environment; the process of polluting.
  • The city has high levels of air pollution.
• Polluter (noun): A person, company, or country that causes pollution.
  • The law penalizes the major polluters.

Synonyms

• Contaminant: A substance that makes something impure or unclean. (Often used interchangeably with "pollutant," though "contaminant" can have a broader, sometimes less severe, meaning.)
• Impurity: An unwanted substance mixed with another, making it less pure.
• Toxin: A poison produced by a living organism. (A pollutant can be a toxin, but not all pollutants are biological toxins.)

Related Phrases

• Pollutant discharge: The release of pollutants into the environment.
  • The permit regulates the facility's pollutant discharge.
• Pollutant load: The total amount of a pollutant entering a system.
  • The pollutant load in the bay has decreased this year.

Học thuật

Noun

1. waste matter that contaminates the water or air or soil