What are the disadvantages of optical smoke alarms?

Optical smoke alarms can be less effective in high-humidity environments, as moisture can cause false alarms or reduce sensitivity. They may also be more prone to dirt and dust accumulation, which can interfere with their operation and require regular maintenance. Additionally, optical alarms can be slower to respond to certain types of fires, such as those involving flames, compared to ionization smoke alarms. Lastly, they tend to be more expensive than traditional smoke alarms.