Based on the users' reviews on the Apple App Store, here are three pros and cons of the 3M Purification Expert app, each described in 15 words or less: **Pros:** 1. Easy to use: Simple interface allows for quick and easy indoor air quality monitoring. 2. Accurate readings: Users praise the app's ability to provide precise and reliable air quality measurements. 3. Personalized advice: The app offers tailored suggestions for improving indoor air quality based on user input. **Cons:** 1. Limited scope: Some users find the app's focus on indoor air quality limited compared to broader environmental concerns. 2. Slow updates: Users report that the app's sensor data can be slow to update, making it less reactive. 3. Technical issues: A few users experience technical glitches, including crashes and connectivity problems.