Has to be led and not laser but still it's a fantastic idea and I wonder how long until air quality sensors start appearing in phones so there is a huge crowdsourced sampling at any event (some high end phones already have temperature and humidity sensors).

They should make it work without a phone though, use the Apple and Garmin APIs to make it work with those watches directly?

I also expect modern devices to have their own downloadable memory at this point without a phone tether needed for sampling (especially at a $100 price point)