4 ms·At least aluminum hydroxide is solid, so it's easy to collect. Hydrogen is gas though.by nephrite 9y agoAt least aluminum hydroxide is solid, so it's easy to collect. Hydrogen is gas though.ema 9y agoHydrogen in low concentrations isn't dangerous and it's gonna be slowly bonded into water again whenever there is a flame or lightning strike.Retric 9y agoSunlight is also important for these reactions. There is quite a bit of ozone which combines with hydrogen to become oxygen + water.