Study of Heavy Metal Pollution in Arid and Semi-Arid Regions Due to Mining Activity: Sonora and Bacanuchi Rivers

Air is one of the most essential compositions of Earth. It is a mixture of invisible gases such as nitrogen and oxygen that freely travels in the atmosphere. In addition, with these gases, air also contains dust particles, pollen grains, bacteria, ashes, soot, and some other fine particles. Air has no definite shape or volume nor color and smell. A good quality of air is needed to keep humans, animals and even plants alive. Atmospheric dust from natural sources are innately present in the atmosphere including those from volcanoes, smoke, ash from fires and pollens from plants and even meteorite dust that enters the Earth upper layer of atmosphere are rarely harmful and partly beneficial. Air pollution is said to be one of the serious problem in the world today. Particulate matter is a composition of air pollution that triggers not just the natural environment but even human’s health.