Define criteria pollutants with example

Criteria pollutants are a group of air pollutants that have been identified by government agencies and international organizations as harmful to human health and the environment. These pollutants are considered to be significant threats due to their widespread presence, adverse effects on health, and contribution to various environmental issues, including climate change, acid rain, and smog formation. The term "criteria pollutants" originated from the United States Environmental Protection Agency (EPA) and has been adopted by other countries and organizations for setting air quality standards and regulations. The common criteria pollutants are:

1. Particulate Matter (PM10 and PM2.5):

   • PM10 refers to particles with a diameter of 10 micrometers or smaller.
   • PM2.5 refers to particles with a diameter of 2.5 micrometers or smaller.
   • Example: Particulate matter includes a wide range of particles, such as dust, pollen, soot, and other fine particles. These particles can be emitted from various sources, including industrial processes, vehicle exhaust, construction activities, and wildfires. They can penetrate deep into the respiratory system and cause respiratory problems and other health issues.

2. Ground-Level Ozone (O3):

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