๐ฉ๏ธ This is so cool: A Redditor living under SFO's takeoff path built a ceiling projection that maps every plane flying over their house in real time, using ADS-B, the open radio signal aircraft broadcast on 1090 MHz. Same feed as FlightRadar24, picked up with a cheap SDR dongle and beamed onto the ceiling.
@LauraFlowD@VicVijayakumar I've also seen "cool mist" humidifiers set air quality monitors' PM2.5 off the charts (which could trigger if someone walks by and wafts the particulates). people say it's safe or just from hard water but switched to evaporative ones just to be safe
@LauraFlowD@VicVijayakumar God we had this happen a few times freaking the kids out, we suspect it was old dust from drywall drilling that got kicked up when (1) a fan turned on pointing toward unit (2) door near unit was opened quickly (3) AC unit turned on for first time in season