What is a primary concern regarding fog spray?

The primary concern regarding fog spray relates to minimum stability. In the context of fog sprays, which are typically used for suppressing pests or in other applications, stability indicates how well the aerosol remains effective over time without separating or settling. A lack of stability can result in uneven distribution of the active ingredients, leading to ineffective application and risks of reapplication, which can cause additional exposure to the environment and potential harm to non-target organisms.

On the other hand, while excessive vapor pressure can affect performance, it is not the main concern. High toxicity levels might bring about safety issues, but they are typically managed through proper handling and application protocols. Inadequate reactivity is usually not an issue with fog sprays, as the formulations aim for a specific reactivity to ensure effectiveness. Therefore, ensuring minimum stability is crucial for maintaining the efficacy and safety of fog sprays in their intended applications.