The document discusses air pollution as a major problem in Ulaanbaatar, Mongolia. Outdoor air pollution, especially in winter, greatly exceeds WHO standards, and is one of the most polluted cities in the world. 10-15% of deaths in the city are caused by polluted air, which negatively impacts heart and lung health. Several solutions are proposed, including supporting renewable energy, improving GDP, building high-rise apartments, electric vehicles, and improving green spaces. Masks and air purifiers can also help mitigate health impacts from the polluted air.