~Air Pollution~

-Introduction

-Pollutants
 ~Sulphur dioxide
 ~Nitrogen dioxide
 ~Carbon monoxide
 ~Ozone
 ~Particulates
 ~Lead

-API
 ~What's API?
 ~In Hong Kong
 ~Equipment
 ~API figures

-Photochemical Smog
 ~What is it?
 ~Problems
 ~Effects

-Acid Rain
 ~How it is formed?
 ~Effects

-Global warming
 ~Greenhouse effect
 ~Effects
 ~What can you do?

-Measures
 ~Part 1
 ~Part 2
 ~Part 3
 ~What can you do../1
 ~What can you do../2

Characteristics: It is a corrosive and highly oxidizing light brown gas which has a characteristic pungent smell at high concentrations.

Source:
	It is formed by oxidation of nitric oxide emitted from fuel combustion from vehicles, power plants, incineration and aircraft whenever fuels are burnt at a very high temperature.

Effect: 
It can irritate the respiratory system and increase susceptibility to respiratory infection. It will also dissolve in water to form acid rain which erodes stones of buildings and makes soil acidic and unsuitable for plant growth. It is also an important element in the formation of photochemical smog.