Not sure how to reply to you directly @welearndnothing, I think we reached max depth? I don't live in a city with a smog problem, and this is not my area of ex

Not sure how to reply to you directly @welearndnothing, I think we reached max depth? I don't live in a city with a smog problem, and this is not my area of expertise. I was just clarifying what I thought @dsfyu404ed was saying, since it seemed to me that @lm28469 had taken it out of context and jumped to a nasty reply that wasn't really pertinent to what was being claimed.