Particulate matter 10 times above the norm in some parts of the country reports the AIR BG platform in relation to the World Health Organization index.
The highest exceedances of the norm are in Vidin, Ruse and Montana. High levels of polluted air in Sofia for the third day, reports bTV.
A combination of clouds and smog is visible from Kopitoto above Sofia.
The Sofia Municipality introduced the measure 2 days ago, due to the problem with fine particulate matter in the capital.
The green ticket is worth 1 leva and is valid for the entire day, including night public transport. Parking in the metro buffer parking lots will also be free for all residents and guests of the capital for the third day.