im not studied chemistry properly in scool, but it looks like Nitrogen dioxide in air (distinctive orange color) do not breeze it, nothing good will come from breathing this.
04/10/22
Ooooh I guarantee that's not an unknowm gas. Definitely Nitrous Oxides, for example from Nitric acid. Not suuuper deadly, but still extremely unhealthy and corrosive. Stay far away.
04/10/22
Such brown colour is typical for nitrogen dioxide. What types of factories do you have there? Do you have one for fertiliser or rockets?
04/10/22
Probably some nitrogen oxide
04/10/22