Being able to test the air that you breath on a regular basis is becoming a real thing that people worry about, so if we have to start doing it, of course we're going to find ways to make it so that it's cool to look at and use, right? And, if you can do it yourself, it just makes it so much better. In this case, all you need is some pretty big balloons, some LEDs, and air sensors, and you'll be good to go.
And, as you can already guess, if you're trying to show off to all your friends that you've got the cleanest air around during your barbeque, this is the best way to make that happen. You just put the air sensor on the balloon, and the LEDs will illuminate to red, yellow, or green, all depending on the cleanliness of the air. Of course, if you want to do this yourself, you'll just have to follow the source link below and get to work. As with anything that's worth having, you'll have to have some technical knowledge to get it done. But, if you do it, let us know in the comments how it goes. We're genuinely interested.