~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: 
Ozone is a highly reactive form of oxygen. At very high concentrations it is a blue unstable gas with a characteristic pungent odour. However, at normal ambient concentrations, ozone is colorless and odourless.

Source: 
It is formed by a series of complicated photochemical reactions of oxygen, nitrogen oxides and reactive hydrocarbons in the presents of sunlight.

Effect: 
It can irritate eye, nose and throat and increase susceptibility to respiratory infections at elevated levels. Ozone is the major component of photochemical "smog", although the haziness and odour of smog are caused primarily by other components. Many plants, such as white pine and soybeans are extremely sensitive to ozone and can be damaged by extended exposure to low levels of ozone.