If your talking about the brown gas u see above cities then that is smog and it consists of carbon monoxide and ozone.
Nitrogen Dioxide
Yes it is gas.
increased gas pollutants in the atmosphere radiate different colored light than the sky with no pollutants
No.
by gas masks and oxygen packs.
Ozone present in the troposphere is also called as bad ozone. It is also a green house gas. It is the major constituent of the urban smog.
ozone
Natural gas.
The current theory of Brown's Gas states that Brown's Gas is a mixture of di-atomic and mon-atomic hydrogen and oxygen. A: Brown's Gas (Oxyhydrogen) is a mixture of hydrogen and oxygen used in welding. It is not coloured.
Yes, photo chemical smog can be a mixture of ozone and other pollutants. Ozone is also a pollutant at ground level.
Activated charcoal is a common component of gas masks. It is a carbon with an extremely high surface area which attracts all manner of pollutants from air and water. Pollutants do not react with the carbon but are adsorbed into the pores. Over time the activated carbon becomes thoroughly coated and it ceases to remove pollutants. However, the charcoal can be reactivated and restored to its original state by baking the charcoal with high heat, which evaporates or burns off the pollutants.
Activated charcoal is a common component of gas masks. It is a carbon with an extremely high surface area which attracts all manner of pollutants from air and water. Pollutants do not react with the carbon but are adsorbed into the pores. Over time the activated carbon becomes thoroughly coated and it ceases to remove pollutants. However, the charcoal can be reactivated and restored to its original state by baking the charcoal with high heat, which evaporates or burns off the pollutants.