Table 3.

Spearman correlation coefficients between hourly particle metrics and air pollutants in Augsburg, Germany, from 2005 to 2015.

	${\text{PNC}}_{10–100}$	${\text{PNC}}_{10–30}$	${\text{PNC}}_{30–100}$	${\text{PNC}}_{100–500}$	PLC	PSCa	${\mathrm{PM}}_{2.5}$	${\mathrm{PM}}_{10}$	${\mathrm{NO}}_2$	${\mathrm{O}}_3$	BC	Air Temperature
${\text{PNC}}_{10–30}$	0.93	1
${\text{PNC}}_{30–100}$	0.94	0.76	1
${\text{PNC}}_{100–500}$	0.67	0.46	0.78	1
PLC	0.77	0.61	0.82	0.83	1
PSCa	0.67	0.50	0.75	0.85	0.92	1
${\mathrm{PM}}_{2.5}$	0.39	0.25	0.47	0.76	0.68	0.78	1
${\mathrm{PM}}_{10}$	0.42	0.29	0.50	0.77	0.70	0.77	0.92	1
${\mathrm{NO}}_2$	0.67	0.58	0.67	0.68	0.71	0.70	0.56	0.57	1
${\mathrm{O}}_3$	$-0.36$	$-0.27$	$-0.40$	$-0.45$	$-0.41$	$-0.49$	$-0.39$	$-0.32$	$-0.49$	1
BC	0.58	0.45	0.65	0.81	0.77	0.82	0.75	0.75	0.74	$-0.62$	1
Air temperature	$-0.13$	$-0.11$	$-0.13$	$-0.19$	$-0.18$	$-0.32$	$-0.31$	$-0.14$	$-0.24$	0.55	$-0.24$	1
Relative humidity	0.04	$-0.02$	0.08	0.11	0.08	0.14	0.14	0	0.13	$-0.66$	0.26	$-0.55$

Note: BC, black carbon; ${\mathrm{NO}}_2$, nitrogen dioxide; ${\mathrm{O}}_3$, ozone; PLC, particle length concentration; ${\mathrm{PM}}_{2.5}$, particulate matter with an aerodynamic diameter below $2.5\mathrm{\mu }\mathrm{m}$; ${\mathrm{PM}}_{10}$, particulate matter with an aerodynamic diameter below $10\mathrm{\mu }\mathrm{m}$; PNC, particle number concentration; ${\text{PNC}}_{10–30}$, PNC of particles with $10–30\text{\hspace{0.17em} nm}$ mobility diameter; ${\text{PNC}}_{30–100}$, PNC of particles with $30–100\text{\hspace{0.17em} nm}$ mobility diameter; ${\text{PNC}}_{10–100}$, PNC of particles with $10–100\text{\hspace{0.17em} nm}$ mobility diameter; ${\text{PNC}}_{100–500}$, PNC of particles with $100–500\text{\hspace{0.17em} nm}$ mobility diameter; PSC, particle surface concentration.

^aFor PSC, measurements during 1 January 2005–30 April 2012 were used.