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A primary pollutant is...

A primary pollutant is

A

CO

B

DDT

C

`CO_(2)`

D

All of these

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### Step-by-Step Solution: 1. **Definition of Primary Pollutant**: A primary pollutant is a substance that is directly released into the environment from a source and causes pollution. These pollutants are emitted directly from identifiable sources and have an immediate impact on air, water, or soil quality. 2. **Examples of Primary Pollutants**: - **Carbon Monoxide (CO)**: This gas is produced from the incomplete combustion of fossil fuels. It is released directly into the atmosphere from sources such as vehicles, industrial processes, and residential heating. - **Carbon Dioxide (CO2)**: This gas is emitted through human activities such as burning fossil fuels for energy, deforestation, and various industrial processes. It is also a primary pollutant as it is released directly into the environment. - **DDT (Dichlorodiphenyltrichloroethane)**: Although DDT is a persistent organic pollutant, it is considered a primary pollutant because it is released directly into the environment from agricultural applications and can accumulate in soils and sediments. 3. **Conclusion**: Primary pollutants are harmful substances that enter the environment directly from their source, leading to various forms of pollution. Understanding their sources and effects is crucial for environmental management and pollution control.
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