1. Learning objectives: To be able to describe the causes, consequences and responses to a transboundary pollution event
Key terminology Transboundary International Point source Diffuse source

2. Acid rain – What is it?
Any form of precipitation with high levels of nitric and sulfuric acids
Two forms, wet deposition and dry deposition.
Wet deposition - pollutants mix with rain water and fall to the ground as acidic precipitation.
Dry deposition - pollutants and particulates fall to the ground without mixing with rain water.
Some acid rain has had pH levels as low as 2

3. Why is acid rain transboundary?
Describe the distribution of the ‘acid rain problem’

4. Main contributors to acid rain
Sulphur dioxide and nitrous oxides = two main chemicals that react with water to make acid rain.
The chemicals are commonly released from power stations, factories and transport. 

5. Sulfur dioxide and nitrogen oxides react with water, oxygen and other substances to form mild solutions of sulfuric and nitric acid. Winds spread acidic solutions across the atmosphere and over hundreds of miles When acid reaches Earth it flows across water surface in runoff and enters water systems and sinks into the soil.

6. Impacts of acid rain Damage to buildings
Metals (iron, aluminum, etc.) dissolved by acid rain can be washed into water courses
Vegetation can be damaged and growth reduced
Lakes and rivers can become acidic harming the ecosystem and aquatic life
Soil acidity increases

7. Impacts of acid rain
rain.php
Make summary notes on:
Aquatic environment
Forests
Soil
Vegetation and plant cover
Buildings
Health

8. Acid rain in China
What are the causes and effects of acid rain in China?

9. Responses to acid rain
after-acid-rain-damage/
What were the responses and how successful were they?