Air Quality Glossary – Earthsense

Term	Definition
AQMA	Air Quality Management Area
ASR	Annual Status Report – an annual report produced by Local Authorities to determine whether the air quality monitoring within their area is within the legal thresholds/limits/objectives
AURN	Automatic Urban & Rural Network – the UK’s automatic air quality monitoring network
CO₂	Carbon Dioxide – a greenhouse gas found within the atmosphere.
CO	Carbon Monoxide – a colourless and odourless gas, which can be poisonous, found within the atmosphere
Data Capture	The percentage of data collected within the monitoring period.
Defra	Department for Environment, Food & Rural Affairs
EC	Electrochemical Sensors
H₂S	Hydrogen Sulphide – a colourless gas, which has an odour associated with it, found within the atmosphere
LSOA	Lower Super Output Area - a small geographical area based upon the population of the area
LUR	Land Use Regression
NAEI	National Atmospheric Emissions Inventory
NO₂	Nitrogen Dioxide – a brown gas which can be found within the atmosphere.
NO	Nitrogen Oxide – a colourless which can be found within the atmosphere.
OPC	Optical Particulate Counter
O₃	Ozone – a gas which can be found within the atmosphere.
Percentile	A statistical measure which defines the percentage of the pollutant concentrations falls within or outside of that proportion of the results.
PID	Photoionisation Detector
PM	Particulate Matter – a mix of solid and liquid particles found within the atmosphere. The size of these particles can vary.
PM₁	Particulate Matter 1 – very fine particulate matter with a diameter of 1 micrometre of less.
PM₂.₅	Particulate Matter 2.5 – fine particulate matter with a diameter of 2.5 micrometre of less.
PM₁₀	Particulate Matter 10 – particulate matter with a diameter of 10 micrometre of less.
SO₂	Sulphur Dioxide - a colourless gas, which has an odour associated with it, found within the atmosphere
TVOC	Total Volatile Organic Compounds – the total sum of all VOC within the atmosphere – whether identified or unidentified.
μg/m ⁻³	Micrograms per Metre Cubed
UK	United Kingdom
WHO	World Health Organisation
1-Hour Means	The average pollution monitored over a one-hour period.
1-Minute Means	The average pollution monitored over a one-minute period.
8-Hour Rolling Mean	The average pollution monitored over a one-hour period, for the duration of eight hours.
24-Hour Means	The average pollution monitored over a 24-hour period.