On a Sunday morning Paheli’s friend visited her home. She wanted to see some flowering plants in the nearby garden. Both of them went to the garden. While returning from the garden they also observed some flowering plants on the road side. But to their surprise they found that the leaves and flowers of these roadside plants were comparatively very dull. Can you help them to know why ?

Explanation

**Step-by-Step Solution:**

1. **Observation of Plants**: Paheli and her friend visited a garden and noticed that the flowering plants there were vibrant and healthy. On their way back, they observed roadside plants that appeared dull in comparison.

2. **Identifying the Difference**: The key difference between the plants in the garden and those on the roadside is their environment. The garden plants are likely in a cleaner, more controlled environment, while the roadside plants are exposed to various pollutants.

3. **Understanding Air Quality**: The air quality around the roadside plants is poor due to several factors. This includes the emission of harmful gases from vehicles, industrial activities, and other sources of pollution.

...