Diurnal variations of O3, continuous PM2.5 mass, CO, ethene, isoprene, NO, NO2, and SO2

at sites across the OTR (including all of VA), for the period May 15 - September 30, 2002. July 6-9 data were excluded because of the influence of the Quebec forest fires. O3 results are shown separately for SLAMS/NAMS (N=208) and CASTNet/other (N=28) sites. "Other" O3 sites include AIRMAP sites in NH, Pinnacle State Park in NY, and Harvard Forest in MA. Ethene (N=19) and isoprene (N=19) results only cover June 1 - August 31 since there are so few measurements outside of this time range. For CO (N=97), NO (N=75), NO2 (N=97), and SO2 (N=134) all available data from AQS and the other special sites (listed above) were included For PM2.5 (N=57), the data from the NE-OPS site in Philadelphia were also included

CMAQ results are from the 2002 BaseB1 simulation. Only those predictions from hours with valid observed concentrations were included here.O3 (SLAMS/NAMS; ppb) O3 (CASTNet & others; ppb) PM2.5 (ug/m3)

EST Observed Predicted Observed Predicted Observed Predicted 0.5 22.1 30.5 30.3 36.6 15.75 18.53 1.5 22.6 30.6 30.1 36.3 15.44 18.87 2.5 24.0 31.5 30.7 36.7 15.26 19.51 3.5 26.6 33.2 32.1 37.6 15.34 20.59 4.5 30.0 35.5 34.2 38.8 15.75 22.20 5.5 34.2 38.4 36.8 40.3 16.87 24.64 6.5 38.9 42.0 39.7 42.1 17.77 25.34 7.5 43.6 45.8 42.8 44.0 17.68 21.74 8.5 47.7 49.3 45.8 45.9 17.16 17.22 9.5 50.8 51.4 48.0 47.1 16.77 14.42 10.5 52.5 51.7 49.4 47.2 16.58 13.07 11.5 52.8 50.6 49.9 46.5 16.58 12.49 12.5 51.6 48.7 49.6 45.6 16.79 12.29 13.5 49.4 46.4 48.8 44.5 17.00 12.24 14.5 46.5 43.8 47.5 43.4 16.96 12.24 15.5 43.2 41.2 45.9 42.2 16.99 12.45 16.5 39.7 38.6 44.1 41.0 17.00 13.17 17.5 36.1 36.5 42.1 40.0 17.04 15.39 18.5 32.7 35.2 40.0 39.5 17.21 18.66 19.5 29.8 34.6 38.1 39.3 17.69 20.02 20.5 27.5 34.2 36.3 39.1 17.80 19.64 21.5 25.6 33.6 34.5 38.8 17.57 19.08 22.5 23.8 32.7 32.8 38.2 17.11 18.68 23.5 22.5 31.5 31.2 37.4 16.66 18.61

NO (ppb) NO2 (ppb) SO2 (ppb) EST Observed Predicted Observed Predicted Observed Predicted 0.5 4.98 1.23 16.60 16.42 3.45 3.57 1.5 4.80 1.04 15.54 15.01 3.47 3.53 2.5 4.58 1.09 14.82 14.41 3.47 3.57 3.5 5.20 1.37 14.98 14.97 3.52 3.69 4.5 7.15 2.49 16.12 17.37 3.46 3.86 5.5 11.49 6.32 17.97 21.48 3.72 4.12 6.5 14.39 12.05 18.68 23.14 4.22 4.08 7.5 12.50 10.79 17.68 19.49 4.79 3.87 8.5 8.77 6.48 15.52 14.45 5.41 4.20 9.5 6.13 4.16 13.50 11.10 5.71 4.58 10.5 4.83 3.11 11.94 9.11 5.60 4.56 11.5 4.04 2.56 10.72 7.96 5.11 4.27 12.5 3.59 2.25 10.11 7.40 4.73 3.99 13.5 3.49 2.16 9.97 7.56 4.38 3.79 14.5 3.42 2.16 10.10 8.28 4.07 3.66 15.5 3.42 2.23 10.52 9.69 4.00 3.70 16.5 3.39 2.46 11.14 12.44 3.73 3.70 17.5 3.00 3.35 12.04 17.69 3.55 4.13 18.5 2.87 4.53 14.36 23.64 3.41 4.64 19.5 3.36 4.44 17.05 25.65 3.35 4.60 20.5 4.07 3.52 18.64 24.44 3.35 4.25 21.5 5.02 2.75 19.07 22.32 3.47 3.96 22.5 5.45 2.05 18.55 20.00 3.50 3.7523.5 5.39 1.53 17.58 17.86 3.51 3.63CO (ppb) Ethene (ppb) Isoprene (ppb) Observed Predicted Observed Predicted Observed Predicted 402.8 269.3 0.82 1.58 0.16 0.27 377.4 253.2 0.77 1.55 0.14 0.21 349.9 248.7 0.71 1.55 0.12 0.16 341.9 255.7 0.70 1.58 0.11 0.11 366.5 293.1 0.75 1.70 0.10 0.10 461.8 409.9 0.97 2.08 0.16 0.32 529.5 545.8 1.01 2.44 0.41 1.10 512.7 484.1 0.88 2.09 0.65 1.63 464.4 365.5 0.73 1.50 0.77 1.46 433.8 307.8 0.60 1.15 0.78 1.25 418.3 280.8 0.51 0.93 0.76 1.14 410.4 268.7 0.43 0.81 0.77 1.10 404.0 264.2 0.38 0.74 0.78 1.12 410.3 269.3 0.34 0.72 0.79 1.22 425.4 280.5 0.34 0.75 0.82 1.44 441.5 296.7 0.36 0.84 0.82 1.80 449.3 322.3 0.38 1.00 0.79 2.42 437.4 365.0 0.43 1.33 0.79 3.34 452.3 410.6 0.55 1.73 0.78 3.45 480.7 414.1 0.74 1.89 0.59 2.34 500.8 383.6 0.85 1.84 0.42 1.43 497.5 348.9 0.90 1.77 0.32 0.91 479.2 318.1 0.90 1.68 0.25 0.59 441.5 288.5 0.87 1.62 0.20 0.39

0.0 10.0 20.0 30.0 40.0 50.0 60.0

0 4 8 12 16 20 24**O 3** **( p** **p b** **)** 

### O3 (SLA **MS/NA MS)** 

Observed
Predicted

0.0 10.0 20.0 30.0 40.0 50.0 60.0

0 4 8 12 16 20 24**O 3** **( p** **p b** **)** 

### O3 (CA **STNet & others)** 

Observed
Predicted

0.00 5.00 10.00 15.00 20.00 25.00 30.00

0 4 8 12 16 20 24**P M** **2 .** **5 (** **u g** **/ m** **3 )**  

### PM2.5 mass

Observed
Predicted

0.0 100.0 200.0 300.0 400.0 500.0 600.0

0 4 8 12 16 20 24**C O** **( p** **p b** **)** 

### CO

Predicted

0.00 0.50 1.00 1.50 2.00 2.50 3.00

0 4 8 12 16 20 24**e t** **h e** **n e** **( p** **p b** **)** 

### Ethene

Observed
Predicted

0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00

0 4 8 12 16 20 24**i s** **o p** **r e** **n e** **( p** **p b** **)** 

### Isoprene

Observed
Predicted

0.00 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00

0 4 8 12 16 20 24**N O** **( p** **p b** **)** 

### NO

Observed
Predicted

0.00 5.00 10.00 15.00 20.00 25.00 30.00

0 4 8 12 16 20 24**N O** **2 (** **p p** **b )**  

### NO2

Observed
Predicted

0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00

0 5 10 15 20 25**S O** **2 (** **p p** **b )**  

### SO2

Observed
Predicted0 5 10 15 20 25Observed
Predicted Observed
Predicted Observed
Predicted Observed
Predicted Observed
Predicted Observed
Predicted Observed
Predicted Observed
Predicted