In the past year or two, the purification industry has seen a surge in optimization efforts for the term "air shower room," leading to a significant increase in the keyword's index. This has led to increasing difficulty in optimizing for this term. So, what factors influence this index?

1. The number of pages indexed by search engines

2. Competing optimization efforts targeting the term "air shower room"

3. Client search volume

4. The number of competing search engine-generated products

These factors combined have exacerbated the optimization index for the term "air shower room." Optimizing for this term has become increasingly difficult over time, and may even become impossible.