The air quality ensemble has been expanded with two more models: EMEP, operated by met.no, and LOTOS-EUROS, operated by TNO. The ensemble consist now of 7 models. By combining the individual model forecast a more accurate prediction is obtained. On the forecast page one can now view the hourly ensemble mean and the ensemble median. The mean provides the averaged model forecast, the median provides the middle (typical) value of the model forecasts. The latter is less sensitive to outliers in model predictions, and is supposed to give the most reliable forecast.