What is nitrogen oxide, sulphur oxide,particulate matter,ground level ozone?
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Environmental and health effects of nitrogen oxides
High levels of nitrogen dioxide are also harmful to vegetation—damaging foliage, decreasing growth or reducing crop yields. Nitrogen dioxide can fade and discolour furnishings and fabrics, reduce visibility, and react with surfaces.
Sulfur dioxide or sulphur dioxide is the chemical compound with the formula SO ₂. It is a toxic gas responsible for the smell of burnt matches. It is released naturally by volcanic activity and is produced as a by-product of copper extraction and the burning of fossil fuels contaminated with sulfur compounds. Wikipedia
Formula: SO₂
Molar mass: 64.066 g/mol
IUPAC ID: Sulfur dioxide
Melting point: -72 °C
Ground-level ozone is not emitted directly into the air, but is created by chemical reactions between oxides of nitrogen (NOx) and volatile organic compounds (VOCs) in the presence of sunlight and heat, making it a summertime pollutant.
Boiling point: -10 °C
Soluble in: Water
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Definition
In most cities air quality has improved (substantially) over the past decades. The visible and noticeable air pollution (smoke, dust, smog) has disappeared from many cities due to local, national and European initiatives. Occasionally air quality poses an immediate threat: during industrial incidents or pollution episodes. Fortunately this is rare. Nevertheless the current air quality still affects peoples health. In many European cities, air quality is a concern and it is therefore monitored around the clock. In most cities, industrial air pollution is, or tends to be replaced by traffic related air pollution. Air quality is therefore a common problem to almost all major cities.
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