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Particulates: Terms commonly associated with particulate matter are particulate
matter with a diameter less than 10
μm (PM10), total suspended particulate (TSP),
primary particulate and secondary particulate. PM10 in the atmosphere can result
from direct particulate emissions (primary PM10) or from emissions of gaseous
particulate precursors that are partly transformed into particles by chemical reactions
in the atmosphere (secondary PM10). TSP consists of matter emitted from sources in
solid, liquid and vapour forms, but existing in the ambient air as particulate solids or
liquids.
Petroleum products comprise refinery gas, ethane, liquefied petroleum gas (LPG),
aviation gasoline, motor gasoline, jet fuels, kerosene, gas/diesel oil, heavy fuel oil,
naphtha, white spirit, lubricants, bitumen, paraffin waxes, petroleum coke and other
petroleum products.
Purchasing power parities (PPP) are the rates of currency conversion that equalize
the purchasing power of different currencies. A given sum of money, when converted
into different currencies at the PPP rates, buys the same basket of goods and services
in all countries. In other words, PPPs are the rates of currency conversion that
eliminate the differences in price levels between different countries.
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