Professor Anna Doboszynska, a respected specialist with more than two decades of experience treating lung disease, minces no words about the health risks it poses.
"During periods of smog, more people with respiratory and circulatory illnesses actually die," she told AFP after examining an asthma patient wheezing heavily amid a spike in pollution in Warsaw.
"Children, pregnant women and the elderly are most at risk from smog, which damages the respiratory tract much in the same way smoking does.
One Warsaw hospital reported a 50 percent spike in patients over several days of intense smog during a windless cold snap in January.
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As anti-smog masks sold out across Poland this week, Warsaw issued them to police officers on duty across the capital.
A study published last year by the European Environmental Agency (EEA) blamed air pollution -- caused in large part by the burning of coal -- for an estimated 50,000 premature deaths per year in the country of 38 million people.
The EEA also blames so-called "low-stack" emissions from old household stoves for countless cases of respiratory illness.
The AirVisuals website regularly lists Warsaw, Katowice or Krakow among the world's top ten most polluted cities alongside Beijing or New Delhi.
Karolina, a Warsaw mother of three who did not wish to reveal her surname, says checking mobile phone apps for smog levels and wearing masks have become part of her family's daily routine.