Aviation Emissions and Air Quality Handbook  Intersection  Pollutant  Averaging  Period  NAAQS  PM Modeling Year (µg/m$^{3}$)  NAAQS  Exceeded?  Year 1  Year 2  No  Action  Proposed  Action  No  Action  Proposed  Action  1  PM$_{2.5 }$ Annual  12  5  6  5  6  No  24-hour  35  8  9  8  9  PM$_{10 }$ 24-hour  150  22  23  22  23  No  2  PM$_{2.5 }$ Annual  12  5  5  5  5  No  24-hour  35  PM$_{10 }$ 150  15  17  18  20  No  Note: PM$_{2.5 }$and PM$_{10 }$ results include background concentrations. Concentrations are for the receptor with highest concentration for  each scenario. µg/m$^{3 }$= micrograms per cubic meter.  Table 7-4. PM Intersection Hot-Spot Results  Intersection  Averaging  Period  NAAQS  CO Modeling Year (ppm)  NAAQS  Exceeded?  Year 1  Year 2  No  Action  Proposed  Action  No  Action  Proposed  Action  1  1-hour  35  2.2  2.2  2.2  2.2  No  8-hour  9  1.5  1.5  1.5  1.5  2  1-hour  35  2.3  2.2  2.1  2.1  No  8-hour  9  1.6  1.5  1.4  1.4  3  1-hour  35  2.6  2.6  2.5  2.5  No  8-hour  9  1.8  1.8  1.7  1.7  Note: 1-hour and 8-hour results include background concentrations. Concentrations are for the receptor with highest concentration for  each scenario. ppm = parts per million.  Table 7-3. CO Intersection Hot-Spot Results  68$_{ }$