Air Pollution
By WTIFS
Outline
I. Introduction A. Importance B. Types
II. Outdoor air pollution A. Source B. Harm C. Solution
III. Indoor air pollution A. Harm B. Source C. Solution
IV. Sealed-space air pollution A. Source B. Harm C. Solution
Intro
≥15 cubic   meters of air   per day
≥2,000,000   people died  per year
Importance