µ micro (10–6)
µg microgram (10–6 grams)
µg/m3 micrograms per cubic metre
µm micrometre (10–6 metres)
µS/cm microSiemens per centimetre
cm centimetre
CO2-e carbon dioxide equivalent units (see Glossary)
GL gigalitres (109 litres)
GL/y gigalitres per year
Gt gigatonne
GWh gigawatt-hour
ha hectare
kg kilogram
kL kilolitre (103 litres)
km kilometre
km2 square kilometres
kWh kilowatt-hour
L litre
m metre
m3 cubic metre
ML megalitre (106 litres)
mm millimetre
Mt megatonne (106 tonnes)
MW megawatt (106 watts)
pH measure of acidity or alkalinity
PJ petajoule (1015 joules)
ppm parts per million
t tonne
y year