A review of the effects of installing air filters in classrooms

I can't figure out what kind of common air filter would filter out natural gas?! Am I won't out would they have never worked for their intended purpose?

Damn auto correct. "Am I wrong or"..

You are correct. The best you can do would be an activated carbon filter, which some better filters have. However, if I am reading/interpreting the graphs correctly, this is talking about over four miles from the leak. You'd be in the 2-5 ppm range (based on surveys) or less for NG (ethane and methane). so, maybe some reduction, but I doubt it would have a physiological effect.

That may be still in the range for mercaptan tracer gas olfaction, in which case carbon would decrease the smell, but that's about it.

You should still be able to edit your comment. There's a two-hour window.