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In page Addis Ababa:

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Outdoor[4] and indoor air[5] and surface and groundwater urban and environmental pollution is largely unregulated in Abbis Ababa.[citation needed] Wastewater is untreated and most is discharged into rivers.[6] At 2017 the increase in air pollution due to anthropogenic emissions[7][8] was found to have increased by around 62% since the 1970s, indicated by a 34% loss in visibility.[9] A 2021 study found annual mean PM2.5 concentrations of 10 µg/m3A, 1.7 times higher than the WHO-recommended 24-hour guideline, to which chronic respiratory disease[10] and an annual total of 502 deaths (4.44%) were attributable.[4]