The air pollution: emissions to concentrations

The air pollution is characterized by the presence of atmospheric gases or particles that cause a change which may have adverse effects on health or the environment. Emissions of gases and particles are of natural (volcanic eruptions, decomposition of organic matter, forest fires) or human (industry, transport, agriculture, residential heating ...). In the atmosphere, these substances undergo various changes under the effect of weather conditions (wind gradients temperature ...). It follows other pollutants and geography of pollution emissions of different origin. Pollutants called "primary" pollutants emitted directly by sources: nitrogen monoxide, sulfur dioxide, carbon monoxide, dust, heavy metals, volatile organic compounds. To these are added pollutants "certificate" from physico-chemical properties of gases under the influence of special weather conditions: ozone, nitrogen dioxide ... concentrations of pollutants in the air are monitored by devices measurement and analysis.