Table 2:

Mean, standard deviation (SD), and range of temperature, RH, PM_2.5, Delta-C, mass at IR, and Delta-C:PM_2.5 by season for time periods with both PM_2.5 and co-located aethalometer data.

Temperature (°C) (BAM)	Mean	SD	Min	Max	n hours
Winter	5.3	4.1	−4.6	17.2	841
Spring	15.6	6.5	−0.2	31.7	1851
Summer – wildfire	22.2	6.0	9.7	38.1	794
Summer – no wildfire	19.4	7.9	5.1	37.7	431
Fall	12.2	5.6	0.8	26.6	690
RH (%) (AgWeatherNet)	Mean	SD	Min	Max	n hours
Winter	74.5	23.7	21.8	99.5	842
Spring	50.9	19.2	14.8	99.4	1851
Summer – wildfire	53.0	21.7	16.8	93.8	765
Summer – no wildfire	56.8	20.7	14.9	94.1	302
Fall	63.8	23.8	16.6	99.3	690
PM2.5 (μg/m3)	Mean	SD	Min	Max	n hours
Winter (BAM, Toppenish)	7.7	6.0	−4.0	39.0	843
Spring (BAM, Toppenish)	4.0	3.7	−4.0	43.0	1853
Summer – wildfire (BAM, Toppenish)	19.6	17.9	−1.0	95.0	794
Summer- wildfire (low-cost monitor, Harrah)	19.7	14.7	2.6	79.1	765
Summer – no wildfire (BAM, Toppenish)	8.8	4.9	0.0	26.0	432
Summer – no wildfire (low-cost monitor, Harrah)	5.8	1.8	3.0	16.5	302
Fall (BAM, Toppenish)	11.1	6.6	−1.0	43.0	687
Fall (low-cost monitor, Harrah)	9.1	5.2	2.2	24.8	691
Delta-C (μg/m3)	Mean	SD	Min	Max	n hours
Winter	0.27	0.32	−0.25	2.76	843
Spring	0.048	0.11	−0.53	1.83	1853
Summer – wildfire	0.34	0.52	−1.48	5.09	765
Summer – no wildfire	0.035	0.14	−0.41	0.40	302
Fall	0.096	0.22	−0.63	2.07	691
Mass at IR (μg/m3)	Mean	SD	Min	Max	n hours
Winter	0.50	0.42	−0.021	2.53	843
Spring	0.23	0.30	−0.035	6.13	1853
Summer – wildfire	0.74	0.84	−0.16	8.34	765
Summer – no wildfire	0.21	0.20	−0.16	0.96	302
Fall	0.41	0.38	−0.13	3.10	691
Note that PM2.5 <1 μg/m3 were excluded when calculating Delta-C:PM 2.5.
Delta-C:PM2.5	Mean	SD	Min	Max	n hours
Winter	0.033	0.034	−0.12	0.27	768
Spring	0.013	0.024	−0.075	0.37	1587
Summer – wildfire	0.017	0.023	−0.093	0.12	765
Summer – no wildfire	0.007	0.024	−0.060	0.060	302
Fall	0.011	0.025	−0.079	0.17	691