Second Hand

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.

Second Hand 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.