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foreignfruit
As tester says, you won’t stop the NOx. In terms of diesel fumes, which are massively on the increase if my own commute is anything to go by, I’d be interested to see what my half respirator does. The vapour filters catch pretty much all organic vapour and particulates down to a size I can’t remember. Essentially, diesel fumes on our roads are a mix of unburned and partially burned hydrocarbons and large particulates (black smoke) from the older diesels, smaller particulates from mid-age diesels (especially chuff of soot on acceleration), very small nanoscale particulates from the newest diesels and whatever that charred candy floss smell is you get from the Adblue cars. Not including the crap they belt out when started and running cold.
Whatever, it’s all nasty shit and you’re asking a lot from a mask to remove it. A lot of the smaller particulates from newer diesels will simply pass straight through even the best industrial masks.