On Tuesday, the World Health Organization (WHO) released a report that says air pollution kills 1,600 people annually in Ulaanbaatar.

Ulaanbaatar is consistently ranked as one of the most polluted cities in the world. The WHO report looked at air pollution’s impact on health in the city since 2008. The research was carried out with the assistance of the Ministry of Nature, Environment and Tourism. The research also found that air pollution causes lung and heart problems in 8,500 people every year.

The report says the concentration of dust particles in the air is 35 times the standard recommended by the WHO. The concentration was especially high in ger districts, where residents typically burn garbage. That means poor and vulnerable households are most affected by air pollution. In fact, the report says the incidence of health problems related to air pollution is many times higher in ger districts than in the city center.

The report says power plants are responsible for 30 to 40 percent of the air pollution in Ulaanbaatar. Specialists say that is why power plants should take measures to reduce emissions.

According to the World Bank, low-cost policies should be implemented within three years to reduce air pollution in the capital. Officials suggest centralized electric-heating systems and planting more trees. For the long term, officials suggest replacing ger districts with apartment blocks.