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.
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.
Nitrogen dioxide is a reddish-brown gas that contributes to the color of smog haze. It is produced from the reaction of nitrogen oxides with sunlight and other pollutants in the atmosphere. Nitrogen dioxide is a harmful air pollutant that can cause respiratory issues and contribute to the formation of ozone and smog.
No.
by gas masks and oxygen packs.
A harmful substance added to the environment is carbon dioxide, a greenhouse gas emitted from burning fossil fuels that contributes to global warming and climate change.
Bromine gas has a reddish-brown color.
ozone
Natural gas.
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.
The gas formed from combining copper and nitric acid is reddish-brown in color due to the formation of nitrogen dioxide gas, which is a reddish-brown gas.