A dust storm has affected large parts of central and eastern Iran this week, with air quality reaching hazardous levels in some areas, visibility falling and authorities closing roads in parts of the country on Thursday.
Air quality monitors showed hazardous pollution levels in parts of Kerman, Yazd, Isfahan, Markazi, Chaharmahal-Bakhtiari, and Sistan-Baluchestan provinces, according to Iranian media.
The sustainable development news site Payam-e Ma reported that air quality index readings reached 500, the highest level on the scale, at several monitoring stations in Kerman province on Thursday morning.
The site said the extent of the dust storm showed it was a regional weather event rather than pollution from local urban or industrial sources.
Experts told the outlet that simultaneous increases in airborne particles across several provinces on Iran's central plateau pointed to weather systems carrying dust across the region.
Repeated droughts, shrinking vegetation cover, dry wetlands and expanding dust sources had increased the frequency and severity of such events, they said.
"From this afternoon, the concentration of dust will gradually decrease," she told state media, adding that skies over the province would remain dusty on Friday, although conditions would improve.
Authorities issue health warnings
Authorities across affected provinces urged residents to stay indoors where possible, wear masks and avoid unnecessary outdoor activity, particularly children, older people and those with heart or lung conditions.
In Isfahan province, crisis management chief Mansour Shishehforoush said a dust mass with domestic origins had entered from Semnan province and northern parts of Isfahan.
"This condition will continue until the end of Thursday," he told IRNA.
He said authorities had ordered temporary restrictions on polluting industrial units and other measures to reduce health risks.
Visibility falls, roads close
In Yazd province, weather official Ghasem Raji said the dust had spread across most parts of the province from Wednesday afternoon into Thursday morning.
"Horizontal visibility in Yazd city reached the critical level of 500 meters at times today," Raji told Mehr. He said relatively strong winds had carried dust into the province from neighboring areas and warned the conditions would continue through Thursday, disrupting travel.
Police in Kerman province said heavy dust and sharply reduced visibility had forced the closure of roads in both directions in Rigan, Fahraj and Narmashir counties until further notice. Authorities urged motorists to avoid the affected routes, slow down elsewhere in the province and postpone unnecessary travel.
Maryam Salajegheh, a Kerman weather official, said conditions would remain severe until Thursday afternoon.
"From this afternoon, the concentration of dust will gradually decrease," she told state media, adding that skies over the province would remain dusty on Friday, although conditions would improve.
In Chaharmahal and Bakhtiari province, a weather official said dust had moved in from central and neighboring provinces and would persist until early next week.
"With the increase in wind speed in the coming days, dust will intensify," the official, identified by state media as Qatreh, said.
