Smoke from wildland fires contains hundreds of chemicals. These chemicals can be gases, liquids, or solid forms. The effects of breathing wildland fire smoke include eye and throat irritation, shortness of breath, headaches, dizziness, and nausea. The scientists in this study wanted to measure the danger smoke poses to firefighters. Topics: Fire, Pollution, Air Pollution, Aldehydes, Applied Science, Carbon Monoxide, Fire, Health Effects.