Today morning Prague, Dečin, and other places faced with a significant air pollution due to wild fire in Czech Switzerland. The levels of PM2.5 and PM10 (particulate matter) exceeded 40 ug per cubic meter, which is far above long term WHO guideline level.
This is a severe incident, the fire propagation is not predictable this time, and many people are continue to fight with it.
Be careful, monitor air pollution and clean the air in living rooms if the levels are high.
By scientists report, it even likely , that it have been several big wild fires