How does urbanization cause air pollution?

Which of the following reasons is the main cause of Acid rain?

1. Due to the emission of CO₂ in the air
2. Due to the emission of Carbon Monoxide in the air
3. Due to the emission of Sulphur dioxides in the air
4. All the above

SPM stands for

1. Suspended Poisonous Matter
2. Soluble Poisonous Material
3. Smoky Particulate Matter
4. Suspended Particulate Matter

Which of the following chemical compounds is mainly responsible for the formation of ozone hole?

1. CO₂
2. CFC
3. SO₂
4. NO