where do some of the natural air pollutants come from
wildfires Volcanic activity Dust Carbon dioxide Vegetation
title: Air pollution text: Health Organization report, air pollution in 2012 caused the deaths of around 7 million people worldwide, an estimate roughly echoed by one from the International Energy Agency. An air pollutant is a material in the air that can have adverse effects on humans and the ecosystem. The substance can be solid particles, liquid droplets, or gases. A pollutant can be of natural origin or man-made. Pollutants are classified as primary or secondary. Primary pollutants are usually produced by processes such as ash from a volcanic eruption. Other examples include carbon monoxide gas from motor vehicle exhausts or sulphur dioxide released title: Pollution in the United States text: Pollution in the United States As with many countries pollution in the United States is a concern for environmental organizations, government agencies and individuals. Examples of land pollution include: Air pollution is caused predominantly from, burning fossil fuels, cars and much more. Natural sources of air pollution include forest fires, volcanic eruptions, wind erosion, pollen dispersal, evaporation of organic compounds, and natural radioactivity. These natural sources of pollution often soon disperses and thins settling near its locale. However, major natural events such as volcanic activity can convey throughout the air spreading, thinning and settling over continents. Fossil fuel burning for title: National Emissions Standards Act text: The six common air pollutants of primary concern to the United States are particle pollution, ground-level ozone, carbon monoxide, sulfur oxides, nitrogen oxides, and lead. These pollutants are detrimental to health, the environment, and a person's home and other belongings. The worst two of the six pollutants are particle pollution and ground-level ozone, which have to be regulated by the EPA. Particle pollution, or particle matter, consists of soot, smoke, and chemically formed "droplets". These particles are very small and can bury themselves deep inside the lungs. Ground-level ozone is found in smog and can also negatively affect the lungs. title: Air pollution text: Air pollution Air pollution occurs when harmful or excessive quantities of substances including gases, particulates, and biological molecules are introduced into Earth's atmosphere. It may cause diseases, allergies and even death to humans; it may also cause harm to other living organisms such as animals and food crops, and may damage the natural or built environment. Both human activity and natural processes can generate air pollution. Indoor air pollution and poor urban air quality are listed as two of the world's worst toxic pollution problems in the 2008 Blacksmith Institute World's Worst Polluted Places report. According to the 2014 World title: Air pollution in British Columbia text: as tetrachloroethylene and trichloroethylene as well as nitrogen monoxide and sulfur dioxide, which Canada seeks to minimize through caps and its tradable permit system. Mount St. Helens has been a significant external natural source: although located entirely in the United States, its eruption created air pollution in parts of British Columbia. Exhaust from internal combustion engines (mainly automobiles and trucks, as well as marine vessels in coastal waters) is a major internal anthropogenic source. Other human-caused sources include: Industrial, agricultural (e.g. manure spreading), commercial operations (e.g., dry cleaners and gas stations) and home heating appliances (furnaces, fireplaces). Radionuclides are generally