Did you see the fog? Surely you can't have mist it...

For many days in a row during the week commencing 13 July 2020, the Adelaide metropolitan area was blanketed in fog until mid-morning. If you visited the Adelaide.sensors.net.au site during these this time you would have seen that the air quality sensors on Victoria Road registered very poor air quality.

The Know Our Ambient Local Air-quality (KOALA) air quality sensors that are being used along Victoria Rd are very cost effective sensors that provide accurate readings for the purpose of our survey. However, because of their size and cost, they do not have the air drying capability of the larger, more expensive units, such as Lefevre 1 and 2. This means that the KOALA’s, during this heavy fog, measure the solid and liquid content of the air, making the data erroneous. This will be corrected during the data validation process.

While this is an unfortunate consequence of using theses monitors, it will have little effect on the overall validity of the study. You may also have noticed that Sensor KOALA 56 showed an error. This was due to a battery failure. A replacement battery has been ordered and will be fitted once it is received.