Air pollution is caused by both natural occurrences and human activities. Natural causes include forest fires, volcanic eruptions, and pollen dispersal. Major human sources are emissions from industries and manufacturing, burning of fossil fuels such as by vehicles, and usage of household and farming chemicals. When these pollutants are introduced into the atmosphere, they can cause damage, disease, or death to humans, animals and plants. Some health effects of air pollution include skin irritation. Videos on the topic provide information on simple steps individuals can take to reduce pollution and save the earth.