EntityQ1520022· pop 8· linked from 18 articlesenvironmental indicatorSign in to savemeasure used to evaluate environmental changeConnectionsperformance indicatorEntityecological indicatorEntitychemistryEntitybirdEntitytemperatureEntityInternational Standard Book NumberEntitynatural environmentEntityWayback MachineEntityozoneEntitydigital object identifierEntityair pollutionEntitystratosphereEntityozone depletionEntityUnited Nations Environment ProgrammeEntitybibcodeEntitysewage treatmentEntityEuropean Environment AgencyEntityhuman impact on the environmentEntitywater qualityEntityenvironmental issueEntityCategoriesEnvironmental and ecological indicatorsEnvironmental statisticsIndicators