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Glossary of Air Pollutant Abbreviations and Terminology

TRS
Total Reduced Sulphur gases, hourly average, measured in parts per billion, includes hydrogen sulphide, odourous compounds
PM10
Particulate matter less than 10 microns in diameter, hourly average, measured in micrograms per metre cubed
SO2
Sulphur Dioxide, hourly average, measured in parts per billion
NO
Nitric Oxide, hourly average, measured in parts per billion
NO2
Nitrogen Dioxide, hourly average, measured in parts per billion
NOx
Total Oxides of Nitrogen, hourly average, measured in parts per billion
CO
Carbon Monoxide, hourly average, measured in parts per million
WS
Wind Speed, hourly average, measured in kilometers per hour
WS1
Wind Speed at first level of three level tower, 10 metres
WS2
Wind Speed at second level of three level tower, 40 metres
WS3
Wind Speed at third level of three level tower, 90 metres
WSMx
Wind Speed, maximum instantaneous value within the hour reported
WSMx_T
Time of maximum Wind Speed value
WD
Wind Direction that wind blows from, hourly average, measured in degrees (0 to 360 clockwise, 0 and 360 = North, 90 = East, 180 = South, 270 = West)
WD1
Wind Direction at first level of three level tower, 10 metres
WD2
Wind Direction at second level of three level tower, 40 metres
WD3
Wind Direction at third level of three level tower, 90 metres
WDSD
Wind Direction Standard Deviation
AT(oC)
Ambient Temperature, hourly average, measured in degrees Celsius
ATMn(oC)
Minimum Instantaneous Ambient Temperature within the hour reported
ATMx(oC)
Maximum Instantaneous Ambient Temperature within the hour reported
ATMx_T
Time of maximum Ambient Temperature value
TEM1
Ambient Temperature at first level of three level tower, 10 metres
TEM2
Ambient Temperature at second level of three level tower, 40 metres
TEM3
Ambient Temperature at third level of three level tower, 90 metres
DT1
Temperature Difference, Level 2 temperature minus Level 1 temperature. Normal temperature gradient is negative with increasing height , inversion is positive value. This measurement is used to identify temperature inversions when pollutants tend to accumulate.
DT2
Temperature Difference, Level 3 temperature minus Level 1 temperature. Normal temperature gradient is negative with increasing height, inversion is positive value. This measurement is used to identify temperature inversions when pollutants tend to accumulate.