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. Author manuscript; available in PMC: 2021 Jun 30.
Published in final edited form as: Atmos Environ (1994). 2021 Mar 29;254:118371. doi: 10.1016/j.atmosenv.2021.118371

Table 3.

Average and standard deviation values for the following parameters as a function of the four air type categories: African dust, OC, EC, AmmNit, AmmSul, sea salt, FS, PM2.5, PMcoarse, daily rainfall, CCN0.2% and CCN1.0%, and the ratio between CCN0.2% and CCN1.0%. Values of “N/A” correspond to no available measurements. Average mass fractions (MF) of IMPROVE species in PM2.5 are also shown.

Dust Smoke Background Other
African dust (μg m−3) 48.17 ± 18.37 N/A 0.48 ± 0.97 2.54 ± 7.14
OC (μg m−3) 0.41 ± 0.13a 1.93 ± 0.68 0.17 ± 0.01 0.51 ± 0.40
MF 0.07 ± 0.03a 0.21 ± 0.08 0.04 ± 0.01 0.10 ± 0.05
EC (μg m−3) 0.04 ± 0.02a 0.47 ± 0.12 0.01 ± 0.00 0.10 ± 0.10
MF 0.01 ± 0.01a 0.05 ± 0.01 0.00 ± 0.00 0.02 ± 0.02
AmmNit (μg m−3) 0.38 ± 0.11a 0.67 ± 0.21 0.25 ± 0.07 0.39 ± 0.17
MF 0.06 ± 0.01a 0.07 ± 0.01 0.06 ± 0.03 0.08 ± 0.03
AmmSul (μg m−3) 1.56 ± 0.33a 2.67 ± 1.02 1.17 ± 0.17 1.80 ± 0.91
MF 0.25 ± 0.05a 0.29 ± 0.11 0.31 ± 0.14 0.33 ± 0.13
Sea salt (μg m−3) 0.80 ± 0.65a 0.16 ± 0.05 0.71 ± 0.24 0.67 ± 0.56
MF 0.11 ± 0.06a 0.02 ± 0.00 0.17 ± 0.04 0.13 ± 0.10
FS (μg m−3) 2.50 ± 1.17a 1.62 ± 1.19 1.15 ± 1.05 1.45 ± 2.08
MF 0.36 ± 0.10a 0.16 ± 0.10 0.23 ± 0.15 0.20 ± 0.17
PM2.5 (μg m−3) 6.54 ± 2.34a 9.54 ± 1.75 4.26 ± 1.54 5.94 ± 3.16
PMcoarse (μg m−3) 7.40 ± 3.82a 44.51 ± 39.85 6.59 ± 1.74 8.58 ± 7.72
Rain rate (mm day−1) 1.23 ± 1.01 0 1.32 ± 1.77 3.45 ± 6.96
CCN0.2% (cm−3) 289 ± 104 1408 ± 976 373 ± 200 343 ± 279
CCN1.0% (cm−3) 591 ± 302 3337 ± 1252 584 ± 323 753 ± 564
CCN0.2%:CCN1.0% 0.54 ± 0.17 0.55 ± 0.17 0.71 ± 0.14 0.55 ± 0.21
a

IMPROVE measurements from EVER1 were unavailable for all dust days. Shown concentrations represent averages for OC, EC, AmmNit, AmmSul, sea salt, FS, PM2.5, and PMcoarse at EVER1 one day after each dust day. The specific dates used were Jul 24, 2017, Jul 27, 2017, Aug 5, 2017, and Sep 4, 2017.