The air quality in parts of Bosnia has suddenly worsened, following the weather stabilisation and drop of air temperatures on Friday, the measurements show.

According to air quality measurement systems in major towns, Tuzla in the north was the most polluted in the morning with the air quality index reaching the level that is unhealthy for certain categories of the population.

The northern town is followed by the central Bosnia's Zenica and Visoko with somewhat lower air pollution and Zivinice in the north.

The capital city of Sarajevo was among the top 10 most polluted cities in the world Friday morning, according to AirVisual with PM2.5 particle level reaching 165, which is considered unhealthy air.

Activists of the ‘EkoAkcija’ group warned that sensitive population could feel the negative effect of the bad air quality and should, accordingly, avoid staying outdoors.

Meanwhile, Sarajevo Canton authorities endorsed a document on Thursday, which should help the capital and its surrounding areas to tackle the burning problem of air pollution.

The cantonal government adopted a document called “Study on urban ventilation corridors and tall buildings impact’ which was drafted by WS Atkins International Limited within the process of preparing the Canton's ‘green action plan’ and with the financial support of the Government of Japan. The European Bank for Reconstruction and Development is implementing the project.