Nitrogen Dioxide Chokes Bulgarian City of Stara Zagora
High concentration of nitrogen dioxide in the southern Bulgarian city of Stara Zagora has been reported, triggering the closure of schools and kindergartens.
The pollution monitoring system in the city detected levels of the chemical substance below the permitted threshold, but above the normal levels, officials explained.
The allowed average hourly quantity of the gas is 210 micrograms per cubic meter, while the permitted threshold stands at 400 micrograms per cubic meter.
Citizens have been urged to avoid going outside and keep the windows of their houses shut.
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