Launch the app
October 2026 — It’s that hazy time of year again here in Singapore, and lots of air quality apps have been popping up thanks to this being The Year of Vibe Coding. But I hadn’t yet seen one that puts these esoteric numbers into terms we can all understand: like smoking. It’s also fitting, given how this is second-hand smoke from a country that loves its cigarettes. So here’s my contribution to the pool.
SecondHand takes the live 24-hour PM2.5 reading for your part of the island and converts it using Berkeley Earth’s rule of thumb (22 µg/m³ over a day is roughly one cigarette). Then it puts that number in your hand! Stay indoors my friends, and keep those air purifiers humming.

Changelog:
- Added a map view (hold down to pop it up)
- Added a haze-free state for better days
- Significant optimizations to size and performance
- Copy changes for clarity
- PSI and 24hr PM2.5 figures now scale with the simulation slider
- Max cigarettes upped from 12 to 20, with room smoke effects




















