The pollutants emitted by jet aeroplanes in outer atmosphere are known as

Options

A. Smog
B. Photochemical oxidants
C. Aerosols
D. Loess

Explanation

To answer the question about the pollutants emitted by jet aeroplanes in the outer atmosphere, we can break it down into the following steps:

### Step 1: Identify the Context
Jet aeroplanes operate at high altitudes, where they emit various pollutants into the atmosphere. Understanding the types of pollutants associated with aviation is crucial.

**Hint:** Consider the types of emissions that result from aircraft engines and their impact on the atmosphere.

### Step 2: Recognize Common Pollutants
The common pollutants emitted by jet aeroplanes include nitrogen oxides (NOx), carbon dioxide (CO2), water vapor (H2O), and particulates. However, the question specifically asks for pollutants that are recognized in the context of environmental chemistry.

**Hint:** Think about specific chemicals that are known to have significant environmental impacts, especially those that are associated with high-altitude emissions.

### Step 3: Focus on Specific Pollutants
Among the pollutants mentioned, chlorofluorocarbons (CFCs) are notable. CFCs are synthetic compounds that have been used in various applications, including refrigeration and aerosol propellants. They are known to deplete the ozone layer when released into the atmosphere.

**Hint:** Recall the importance of the ozone layer and how certain chemicals can affect it.

### Step 4: Conclusion
The pollutants emitted by jet aeroplanes in the outer atmosphere are primarily known as **aerosols** and **chlorofluorocarbons (CFCs)**. These compounds can contribute to atmospheric pollution and have significant environmental effects, particularly in relation to ozone depletion.

**Final Answer:** The pollutants emitted by jet aeroplanes in the outer atmosphere are known as **aerosols** and **chlorofluorocarbons (CFCs)**.