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The article states "When ammonia becomes airborne, it quickly expands and forms a large cloud that acts like a heavier-than-air gas", the problem is that ammonia is lighter than air. The formula mass of ammonia is 17 grams per mole while the formula mass of air (assume air is 80 % N2 and 20 % O2) is 28.8 per mole. So ammonia gas will be 0.49 grams per litre lighter than air. I am sure that ammonia will tend to rise up into the air in a similar way to methane (FW = 16).