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This data is taken from table number 15-4 from page 233 of the report Demographic indicators 2 - 2020.

This data is taken from table number 15-3 from page 232 of the report Demographic indicators 1 - 2020.

This data is taken from table number 15-2 from page 231 of the report Population of cities - 2020.

This data is taken from table number 15-1 from page 230 of the report Population of Tehran province - 2020.

This data is taken from table number 14-8 from page 214 of the report The ratio of the population covered by municipal wastewater collection and sanitary disposal services to the total population - 2020.

This data is taken from table number 14-6 from page 212 of the report The number of active air pollution measurement stations in cities with a population of over 100000 - 2020.

This is the data from a poll conducted by Iran Open Data.

This data is taken from table number 7-7 from page 106 of the report Proportion of the population covered by the safe drinking water pipe network - 2019.

This data is taken from table number 7-5 from page 105 of the report Average consumption of drinking water per urban household subscriber - 2019.

This data is taken from table number 7-4 from page 104 of the report The rate of urban water growth compared to last year - 2019.

This data is taken from table number 7-3 from page 103 of the report Share of water consumption in domestic and industrial sectors in urban areas - 2019.

This data is taken from table number 7-2 from page 102 of the report Drainage and withdrawal from underground water sources: water year 2017-2018.