Seyyedeh Narges Karimpour - Department of Environmental science, Ardabil Branch, Islamic Azad University, Ardabil, Iran
Leila Rostami Baigagh - Department of Environmental science, Ardabil Branch, Islamic Azad University, Ardabil, Iran
Saba hajjabbari - Department of Environmental science, Ardabil Branch, Islamic Azad University, Ardabil, Iran

Noise pollution in cities is one of the important environmental issues whichcauses harmful effects such as hearing loss, sleep disorder, hypertension andgastrointestinal complaints in people of cities. To prevent these effects andaccess to recommended standards, measuring noise pollution in cities isnecessary. This study aims to identify amount of noise pollution ingeographical arena of Khalkhal Town. Using sound maps, in 22 stationswith regular 500 m distances in systematic random sampling, measuringwere done in time slots of morning and evening in winter 2014 and summer2015 through 450 cell hydrophone. Results indicated that noise pollution inKhalkhal Town is higher than standard in day according to Iran’sEnvironment Standard in days (50 db) with average of 52/4313 db. Also,results of t-test at night (Iran’s Environment Standard = 45 db) indicatedthat average of noise pollution in Khalkhal City (48/8370 db) is higher thanstandard limit.

Noise pollution,Khalkhal Town,Statistical data