How the hell do you accurately measure happiness? It sounds so abstract. Also who claims the authority of deciding this? I am honestly asking out of curiosity.
Penpot is quite easy to use and show a presentation in. Use unsplash or pexels for images and the prototype view for presenting.
If you're not looking for FOSS there's a lot of AI presentation tools out there.
Not by much unfortunately. Car tires and brakes release very dangerous particles that are even smaller than PM2.5, but considering that the majority of cars are petrol cars, the pool of vehicles should be smaller.
I know how to do it, I just don't trust them. Thanks though.