Having clean air to breathe is an often overlooked necessity, yet humans pollute the air through growing demand for energy and consumables. This book presents and overview of air quality, emission sources, criteria pollutants, greenhouse gases, control programs, and the impact of pollution on the atmosphere and global systems. Expertise in many fields is needed to protect air quality--politics, environmental engineering, law, planning, meteorology, health sciences, data management, and more. The book will guide readers through strategies and measures to prevent air pollution and better understand challenges that emission sources pose to society and ecosystems.