How are flue gases from industries freed from oxides of nitrogen and sulphur ?

Explanation

**Step-by-Step Solution:**

1. **Understanding Flue Gases:**
- Flue gases are a mixture of gases that are produced when fuels are burned. This can occur in various settings, such as power stations and industrial plants. The primary components of flue gases include carbon dioxide (CO2), water vapor (H2O), and pollutants like oxides of nitrogen (NOx) and sulfur (SOx).

2. **Identifying Pollutants:**
- The main pollutants in flue gases that need to be removed are oxides of nitrogen (NO and NO2) and sulfur dioxide (SO2). These gases can contribute to environmental issues such as acid rain and air pollution.

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