Pollutants

• NO₂: Nitrogen Dioxide. Is mainly formed in the atmosphere by a reaction between Nitrogen Monoxide (NO), and Ozone (O₃).
• NO: Nitrogen Monoxide. NO is relatively harmless, but is transformed to NO₂. There are limit values for the sum of NO and NO₂, i.e. NO_x.
• CO: Carbon Monoxide or Carbon oxide.
• Ozone: O₃. In urban areas ozone is breaked down by NO from the traffic. Normally the highest contrations are found on the country and in urban backgrounds.
• SO₂: Sulphur dioxide.
• TSP: "Total Suspended Particulate matter" i.e. particles. Measurements of TSP are from anno 2001 replaced by measurements of PM₁₀.
• PM10: Particles less than 10 µm.
• PM2.5: Particles less than 2.5 µm.
• PM10 (TEOM): Particles less than 10 µm measured with the TEOM method.
  This method yields lower results than the standard method and cannot be directly compared to limit values.
• PM2.5 (TEOM): Particles less than 2.5 µm measured with the TEOM method.
  This method yields lower results than the standard method and cannot be directly compared to limit values.
• As: Arsene.
• Cd: Cadmium.
• S: Sulphur as particles.
• Ni: Nickel
• Mn: Manganese
• Se: Selene
• Pb: Lead.
• BaP: Benz(a)pyren.
• Benzene.
• Toluene.