Pollution index (Good, Moderate, Unhealthy, or Very Unhealthy)?
Horrible in winter. Very good in summer. It is horrible in the winter because of what people burn to heat their gers. Ulaanbaatar was designed for 300K-350K people; current population is about 1.1M. - Jan 2009
Always good in the country side, unhealthy to very unhealthy in the city. - Oct 2008