A pollutant or novel entity[1] is a substance or energy introduced into the environment that has undesired effect, or adversely affects the usefulness of a resource. These can be both naturally forming (i.e. minerals or extracted compounds like oil) or anthropogenic in origin (i.e. manufactured materials or byproducts).

Pollutants with the strongest evidence for public health concern include particulate matter (PM), carbon monoxide (CO), ozone (O 3), nitrogen dioxide (NO 2) and sulfur dioxide (SO 2). Health problems can occur as a result of both short- and long-term exposure to these various pollutants.

2024年12月21日 · pollution, the addition of any substance (solid, liquid, or gas) or any form of energy (such as heat, sound, or radioactivity) to the environment at a rate faster than it can be dispersed, diluted, decomposed, recycled, or stored in some harmless form.

2 天之前 · Pollution is the introduction of harmful materials into the environment. These harmful materials are called pollutants. Pollutants can be natural, such as volcanic ash. They can also be created by human activity, such as trash or runoff produced by factories. Pollutants damage the quality of air, water, and land.

2023年2月17日 · Pollution is defined as introducing harmful substances (solid, liquid, or gas) or any form of energy (light, heat, sound, or radioactivity) into the environment. The harmful elements that damage air, water, and land quality and cause pollution are called pollutants.

Nitrogen dioxide (NO2) is both a primary and secondary air pollutant. Other important gaseous pollutants are ammonia, carbon monoxide, volatile organic compounds (VOCs) and persistent organic pollutants (POPs) which we discuss below.

2023年3月17日 · Pollution is the process of making land, water, air or other parts of the environment dirty and not safe or suitable to use. This can be done through the introduction of a contaminant into a...

The meaning of POLLUTANT is something that pollutes; especially : something (such as anthropogenic waste) that makes an environment unsuitable or unsafe for use. How to use pollutant in a sentence.

2024年10月24日 · Ambient (outdoor) air pollution is estimated to have caused 4.2 million premature deaths worldwide in 2019. Some 89% of those premature deaths occurred in low- and middle-income countries, and the greatest number in the WHO South-East Asia and Western Pacific Regions.

2024年11月12日 · Hazardous air pollutants are those known to cause cancer and other serious health impacts. The Clean Air Act requires the EPA to regulate hazardous air pollutants, also known as air toxics, from categories of industrial facilities in two phases.