That seems reasonable and likely, but it is worth pointing out that there is very little evidence collected about this. And what study has been done of indoor

That seems reasonable and likely, but it is worth pointing out that there is very little evidence collected about this. And what study has been done of indoor air quality seems to indicate that there are problems, though eliminating natural gas fixtures may not be the best response. What might be a good option would be to study the issue in more detail then come up with possible responses and study those also in order to formulate a response that is effective.