Editing Vog (section)

==Comparing vog and smog==
{{unreferenced section|date=August 2021}}
Vog and [[smog]] are different. Vog is formed when sulfur oxides emitted by a volcano react with moisture to form an [[aerosol]]. The aerosol scatters light, thus making the vog visible. Smog is formed largely from the incomplete [[combustion]] of fuel, reacting with [[nitrogen oxides]] and [[ozone]] produced from [[carbon monoxide]] by reactions with sunlight. The result is also a visible aerosol.

When smog levels are high, the sky appears yellowish-grey because nitrogen oxides are yellow. In contrast, [[sulfur oxide]]s are colorless and vog looks grey. Once the vog layer dissipates, grey spots of vog in the sky may, for a time, remain trapped in the inversion layer.

Several chemicals emitted from cars are not emitted from volcanoes. Similarly, some chemicals emitted from volcanoes, such as [[hydrogen sulfide]], [[hydrogen chloride]], and [[hydrogen fluoride]], are not created by [[exhaust gas]]. Moreover, smog generated by factories has its own unique mix of contaminants.{{citation needed|date=August 2019}}