Abstract
Monitoring program was conducted in Muna Valley during Muslim pilgrimage period, 1402 H (1982 G). Measurements of sulphur dioxide, ammonia and particulates were carried out at the middle of the busiest place in the valley. The results of the present work confirm that the atmosphere of Muna Valley is favouring the accumulation of pollutants to the limits causing adverse health effects for pilgrims. Control measures should be adopted and environmental planning for Muna Valley should be considered. These measures are urgently needed to avoid air pollution episodes in the valley during the occupancy of more than 2 million persons.