The graph includes the combined emissions of primary PM10 particles (particulate matter with a diameter of 10 μm or less, emitted directly into the atmosphere) and secondary particulate-forming pollutants (the fraction of sulphur dioxide, SO2, nitrogen oxides NOx and ammonia NH3 which, as a result of photo-chemical reactions in the atmosphere, transform into particulate matter with a diameter of 10μm or less). Emissions of the secondary particulate precursor species are weighted by a particle formation factor prior to aggregation: primary PM10 = 1, SO2 = 0.54, NOx = 0.88, and (NH3) = 0.64.
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Instead of using a fresh piece of paper for rough work, turn over a used copy and write on the other side. Use products made of recycled paper. Remember! Every ton of recycled paper saves 17 trees compared to paper made from virgin materials.
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