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Weekend/Weekday Ozone Observations in the South Coast Air Basin

Weekend/Weekday Ozone Observations in the South Coast Air Basin

Weekend/Weekday Ozone Observations in the South Coast Air Basin

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Estimated NOx<br />

Estimated NOx (ppb)<br />

500<br />

400<br />

300<br />

200<br />

100<br />

Mon, 10/2<br />

Wed, 10/4<br />

Sat, 10/7<br />

Sun, 10/8<br />

0<br />

Carryover Inhibition Accumulation Carryover* Freeway Truck<br />

Freeway Loops Regional No Trucks Stop**<br />

Black Carbon (ug/m3)<br />

15.0<br />

12.0<br />

9.0<br />

6.0<br />

Black Carbon<br />

Mon, 10/2<br />

Wed, 10/4<br />

Sat, 10/7<br />

Sun, 10/8<br />

3.0<br />

0.0<br />

Carryover Inhibition Accumulation Carryover* Freeway Truck<br />

Freeway Loops Regional No Trucks Stop**<br />

Figure 4.3-3a. Average NOy and black carbon on freeway loops dur<strong>in</strong>g carryover, ozone<br />

<strong>in</strong>hibition, and ozone accumulation periods compared to regional sites and source-dom<strong>in</strong>ated<br />

samples.<br />

4-37

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