浓郁 (nóng yù) describes a rich, strong, and pleasant intensity of fragrance, flavor, or atmosphere—like a wine or floral scent. It is more focused on scent and taste than 浓厚 (nóng hòu), which can also describe deep interest or emotion, and more evocative than 浓重 (nóng zhòng), which also applies to heavy accents or thick paint. The simpler 浓 (nóng) just means 'thick/concentrated' (liquids, fog, color).