New NO2 Air Standards Prove Technically Challenging

This article from Trinity Consultants refers to June 28, 2010 modeling guidance from EPA (link below) that doesn't actually provide much guidance, but it does suggest an interim SIL. It also reports a SIL that NESCAUM states are using. The article discusses methods for estimating NO/NO2 ratios.

Trinity Consultants - New NO2 Air Standards Prove Technically Challenging

EPA NO2 Modeling Guidance 6/2010