Ozone is a colourless, toxic gas. At ground level, it is formed from nitrogen oxides and other volatile organic compounds by solar radiation, through photochemical processes.
PM10 summarizes all solid and liquid particles with different chemical compositions with a diameter smaller than 10 μm.
PM2.5 summarizes all solid and liquid particles with different chemical compositions with a diameter smaller than 2.5 μm.
Nitric oxides are by-products of combustion processes. Under sunlight, they are instrumental in the formation of ground-level ozone and are also a source of fine dust.
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