Figure 2 shows the proportion of indicators for which ‘Clean air’ is the primary goal that have been assigned to each assessment category, with the exact number of indicator components shown as a label on the bars.
Of 10 indicator components, 6 showed an improvement over the short term. One indicator component showed little or no change and 3 showed a deterioration. This short-term time period covered the most recent 5 years for which an assessment can be made. This was 2013 to 2018 for most components, and 2014 to 2019 or 2015 to 2020 for others. Most indicator components recorded the same results over the medium and long-term time periods, where a sufficiently long time series was available to make an assessment. However, emissions of ammonia assessed by A1 showed a deterioration in the short to medium term in contrast to little or no change over the long term.