I am a US expat. I survived living in Los Angeles for a decade during some of the worst years of air pollution in the 1970s. The air pollution in Podgorica however may drive me out after living here for three years.
According to the WHO, the Balkans have the worst air in Europe that is many times more polluted than WHO and EU standards. Sadly, for the most part, the sources of that pollution are not from within Montenegro, but instead originate from cheap high-sulfur coal plant emissions in Serbia (36%), Bosnia and Herzegovina (30%) and Kosovo (24%). Local wood burning for residential heat is another source of the pollution. Montenegro is unfortunately downwind of the worst sources when the prevailing wind is out of the north and northwest.
Using official records, the air pollution in Podgorica has been worst in December and January, with the "PM2.5" level (the most dangerous pollution) reaching "Very Unhealthy" levels. You can see the history of Podgorica's air pollution at the bottom of this page: https://aqicn.org/city/podgorica/. An excellent overview of the issue can be found here: https://www.blue-europe.eu/analysis-en/full-reports/pollution-in-the-western-balkans-part-1-an-overview/.
Personally, I have experienced the pollution by developing pneumonia in December/January 2020, 2021, and 2022; and daily I experience it with burning and runny eyes similar to the effects from pealing onions. I have coped by installing air filers in my home, but those filters are ineffective against gasses like sulfur dioxide, and of course do no good when I am outdoors. My advice for anyone who is at all sensitive to air pollution is to avoid the region from November through February.