ling-jyh chen developed a low-cost, portable device that monitors air pollution, specifically fine particlesrred to as pm 2.5. it's called an airbox. we have a pm 2.5 censor inside, and we also have wi-fi connectivity, so for example right now i connect to my wi-fi router, a 4g router, and send data through the internet. and from the internet, we can use a smartphone app or a website or web browser to figure out what's the current, real-time air quality. in order to test the device, ling-jyh set it up close to what is known as "scooter waterfall": a ramp in taipei that is exclusively reserved for the use of, well, scooters. the riders here are commuting from new taipei city. every city has tourist attractions, right? the things you've got to see in a certain city. since we've been here this morning, there are so many people coming here - like tourists taking photos of the famous, infamous scooter waterfall. it hasn't stopped for the past 40 minutes; it's what you see there, non-stop. roughly 13,000 scooters cross taipei bridge during rush hour from seven to nine am, every single day. there's