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Acute Respiratory Infection is an infectious disease that attacks one part or more of the airways. Acute respiratory infections often occur in children, because the child's immune system is still low. In 2016, there were 139 children affected by ARI in the Uteun Pulo Health Center area of East Seunagan District, Nagan Raya District. The purpose of this study was to determine the relationship of ventilation, occupancy density, ceilings / roofs and floors with the incidence of ARI in infants in the Uteun Pulo Community Health Center in Seunagan Timur
District, Nagan Raya Regency. Analytical research methods with cross sectional approach. The population in this study as many as 1,377 mothers who have toddlers with a total sample of 93 mothers of toddlers, the study was conducted on 15 November - 14 December 2017. Data collection using a questionnaire was analyzed using the Chi Square test. From the results of the study note that there is a relationship between ventilation P.Value = 0.016 (OR = 4.3) occupancy density P.Value = 0.001 (OR = 8.2), Ceiling P.Value = 0.04 (OR = 6.3) and P.Value floor = 0.008 (OR = 4.4) with ARI occurrence in children under five years
old in the Work Area of Uteun Pulo Health Center, East Seunagan District, Nagan Raya Regency. It is expected that mothers who have toddlers to have good habits in the household, especially avoiding risk factors for ARI and to reduce the density of occupancy in one house so that toddlers avoid ARI

Ventilation; Occupancy Density; Ceiling; Floor and ARI