تركيز غاز أول أكسيد الكربون داخل نفق السوق الصغير في مكة المكرمة خلال شهر رمضان لعام 1417 ه

Abstract EN

The results of field measurements inside one of the major tunnels in the holy city of Makkah, during the glorious month of Ramadan, has shown that the concentrations of carbon monoxide gas have exceeded the local and international standards.

The recorded levels are believed to be harmful to the users and workmen in this tunnel.

These are usually traffic policemen, taxi, private cars and bus drivers and passengers, as well as homeless users amongst foreign ’Umra’ Performing visitors and also street vendors.

At night, the geometric means of CO measured in the tunnel varied from 43.22 to 79.79 ppm during the month of Ramadan.

The measured levels are considered high as compared with levels reported for similar cases in other countries such as Japan and U.S.A.

The concentration of CO ranged from 11-15 ppm in a highway tunnel in Osaka, Japan where the highest 1-hr average of CO concentration of 21 ppm was reported in the Allegheny Tunnel on the Pennsylvania Turnpike, U.S.A.