806 ITU‐T's Technical Reports and Specifications Sub‐dimension Indicator Description I2.5.6 Soil pollution avoidance Proportion of soil pollution incidents with successful early warning and emergency detection of heavy metal, chemicals and acid etc. through ICT. I2.5.7 Green areas surface Proportion of municipal territory allocated to publicly accessible green areas. (*) I2.5.8 Perception on environmental quality Proportion of city inhabitants satisfied with the urban environment. (*) NOTE – Indicators marked by (*) are not ICT specific indicators but indicators focusing on general city sustainability. NOTE – This sub‐dimension marked by (**) looks into the CO2‐e/GHG emissions of the city where \"‐e\" is \"equivalent\" and all other greenhouse gases are converted into CO2. 6.2.2 Productivity This clause lists the core indicators defined for productivity and economic sustainability. There are 7 indicators in this dimension, covering expenditure of ICT to improve industry productivity, service industry employment, saving, city export/import, household ICT expenditures, ICT investment, and ICT related patents etc. Sub‐dimension Indicator Description D3.1 Capital investment I3.1.3 Improvement of industry productivity through ICT Productivity enhancement in industry through ICT measured as the impact of ICT on value added per person employed. NOTE – This is the contribution from ICT investment. NOTE – Value added per person employed is generally referred to as labour productivity. D3.2 Employment I3.2.1 Service industry employment Proportion of employees working in service industry in the city compared with the total employed workforce. (*) D3.5 Savings I3.5.1 Saving rate Proportion of total incomes for each household remaining after deducting consumption and expenditures. (*) D3.6 Export/import I3.6.1 Knowledge‐intensive export/import Proportion of export/import of knowledge‐intensive goods and services within a city compared to the total industrial export/import. (*) NOTE – Amount of export/import may be counted among cities, maybe in the same country. NOTE – In some cases data is only available at country level. D3.7 Household income/consumption I3.7.1 Household ICT expenditures Proportion of household expenditures related to ICT.