Hi! I understand your Airthings app on macOS Catalina (10.15.7) is becoming unresponsive. Let's work through some steps to get it running smoothly again.

Could you please let me know:

- Is the app freezing as soon as you open it, or does it become unresponsive after some time or specific actions?
- Have you tried quitting and restarting the app?
- Is your Airthings device connected via Bluetooth or Wi-Fi?
- Have you recently updated the app or your macOS?

Meanwhile, here's a simple plan to try:

1. Force Quit the App: On your Mac, click the Apple menu (top-left corner) > Force Quit… > Select Airthings app > Force Quit. Sometimes this clears any temporary hang-ups.

2. Restart Your Mac: Sometimes a simple reboot helps clear system glitches.

3. Check for App Updates: Open the Mac App Store and see if there's an update for Airthings. Updates often fix bugs.

4. Reinstall the App: If force quitting and updates don't help, delete the app and reinstall it fresh from the official source.

5. Check Bluetooth/Wi-Fi: Ensure your Mac’s Bluetooth is on and that you have stable Wi-Fi if your device connects this way. You can toggle Bluetooth off and on again in System Preferences > Bluetooth.

If after these steps the app is still unresponsive, there may be a deeper connectivity issue or a bug. In such a case, resetting the device connection or checking the device’s battery (if applicable) can help. I can guide you through that as well.

Let me know what you observe or if you’ve already tried any of these steps!