| 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. | |