Carbon Monoxide and NOx are not considered greenhouse gases, why are you focusing on those?
Nitrous Oxide is a greenhouse gas and Carbon Monoxide as well as the rest of the NOx family are secondary greenhouse gases. However, Pigeonblog is not a project about global warming. We’re mostly concerned about ground level pollution. NOx is a major contributor to the formation of ozone, acid rain and particulate matter. CO is invisible and without scent, while yet very harmful to human health. Please refer to the pollution section for more information.