YunFanLabs
Product support
Tell us the product, device and OS version, the steps that led to the issue, and a screenshot without sensitive information. We will start by reproducing the problem.
If no email app opens, copy the address and send from your preferred email service.
01 / Help us help faster
Product, device model, OS version, and app version.
What you did, what you expected, and what happened instead.
Remove names, locations, account details, and other sensitive content before sending.
02 / What it is for
Translate AQI or PM2.5 into cigarette-equivalent exposure framing, practical risk context, and guidance for commuting, exercise, children, and smoke events.
A decision aid, not a medical diagnosis. Estimates are for context and planning; consult health authorities and qualified professionals when needed.