La Paz as »Million-City« in a deep basin at an altitud of 3200-4000 m:
The Bolivian seat of government La Paz, located at an altitude of 3,650 m, and the sister city El Alto, which is still 400 m higher, are by far the highest million-cities in the world. The geographical position of La Paz in a deep basin causes airborne pollutants to accumulate in the city. Especially during the dry season, air pollution reaches critical values.
Due to their altitude, La Paz and El Alto are very vulnerable to the effects of climate change: strong glacier melt, high temperatures, frequent extreme events (heavy rain and drought). The adaptation efforts of the Municipality of La Paz are aimed at ensuring water supply and civil protection and are running relatively successfully. However, work in rural areas on a nature and water sanctuary is proceeding very slowly.