Abstract: Ammonia emission from chicken excreta is due to high amino acid and protein diets given to the chickens to accelerate growth. The excess amino acids are deaminated and the derived nitrogen is excreted in the urine mainly as uric acid, which is readily converted to urea and finally to ammonia. The emission of high levels of ammonia in poultry houses is undesirable as ammonia is toxic and can adversely affect chicken growth. This study investigated the factors that influences the generation of high levels of ammonia in poultry houses. The factors investigated were pH, moisture content and the age of excreta.