85 Annual Report 2021 For easier comparison, Figure 20 shows the annual change in SO2, NOx, and AP emissions during the reporting period using common logarithmic scales. Figure 20 - Annual variation of the environmental indicators of AP, SO2, NOx emissions from conventional large-scale electricity generation plants (g/kWh) (logarithmic scale) NOx, SO2, PM emmisions per unit of energy generation (g/kWh
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