NO2 is generated at my workplace. What is the minimum concentration (in ppm) to be able to smell it?

Question

NO2 is generated at my workplace. What is the minimum concentration (in ppm) to be able to smell it?

Answer 1

3 parts per million is the industrial exposure limit, and at over 4 parts per million you can not smell it any more because it has numbed the nerves in your nose.

If you smell it you should be getting a gas test done in the area.

If you smell it and then do not you should be leaving the area quickly and getting help.