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Table 4

The Sen-Theil estimators for summertime mean of daytime average and DMA8 regional trends, with p-values derived from Mann-Kendall tests (summertime mean in eastern North America). DOI: https://doi.org/10.1525/elementa.243.t4

Daytime average
Intercept (ppb)Slope (ppb yr–1)p-value# Site

 
All sites 43.73 –0.30 <0.0001 756 
p = [0.05–1.00] 42.55 –0.20 <0.0001 483 
p = [0.10–1.00] 42.39 –0.17 0.0002 414 
p = [0.15–1.00] 42.07 –0.15 0.0011 356 
p = [0.20–1.00] 41.87 –0.13 0.0067 304 
p = [0.30–1.00] 41.69 –0.12 0.0218 251 
p = [0.40–1.00] 41.32 –0.11 0.0365 205 
p = [0.50–1.00] 40.86 –0.09 0.0657 158 
DMA8
 
 Intercept (ppb) Slope (ppb yr–1) p-value # site 

 
All sites 50.15 –0.43 <0.0001 756 
p = [0.05–1.00] 48.25 –0.28 <0.0001 382 
p = [0.10–1.00] 47.58 –0.23 <0.0001 301 
p = [0.15–1.00] 47.10 –0.21 <0.0001 255 
p = [0.20–1.00] 46.69 –0.18 0.0007 208 
p = [0.30–1.00] 46.25 –0.16 0.0038 158 
p = [0.40–1.00] 45.65 –0.13 0.0185 119 
p = [0.50–1.00] 45.03 –0.11 0.0432 93 
Daytime average
Intercept (ppb)Slope (ppb yr–1)p-value# Site

 
All sites 43.73 –0.30 <0.0001 756 
p = [0.05–1.00] 42.55 –0.20 <0.0001 483 
p = [0.10–1.00] 42.39 –0.17 0.0002 414 
p = [0.15–1.00] 42.07 –0.15 0.0011 356 
p = [0.20–1.00] 41.87 –0.13 0.0067 304 
p = [0.30–1.00] 41.69 –0.12 0.0218 251 
p = [0.40–1.00] 41.32 –0.11 0.0365 205 
p = [0.50–1.00] 40.86 –0.09 0.0657 158 
DMA8
 
 Intercept (ppb) Slope (ppb yr–1) p-value # site 

 
All sites 50.15 –0.43 <0.0001 756 
p = [0.05–1.00] 48.25 –0.28 <0.0001 382 
p = [0.10–1.00] 47.58 –0.23 <0.0001 301 
p = [0.15–1.00] 47.10 –0.21 <0.0001 255 
p = [0.20–1.00] 46.69 –0.18 0.0007 208 
p = [0.30–1.00] 46.25 –0.16 0.0038 158 
p = [0.40–1.00] 45.65 –0.13 0.0185 119 
p = [0.50–1.00] 45.03 –0.11 0.0432 93 
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