Table 2.

Summary statistics for wildfire, air pollution, and weather by region, 2001–2018.

		First trimester				Second trimester				Third trimester
Region	Variable	Min.	Mean	SD	Max.	Min.	Mean	SD	Max.	Min.	Mean	SD	Max.
North	Wildfire records	0	23.72	161.95	9,114	0	24.74	176.87	12,813	0	29.49	216.01	12,822
	PM2.5 (μg/m³)	2.02	39.01	39.15	461.86	2.03	37.65	38.89	472.20	1.91	37.70	40.01	485.00
	Temperature (°C)	22.35	26.28	0.98	29.95	22.33	26.31	0.97	29.95	22.34	26.36	1.02	29.95
	Relative humidity (%)	38.00	84.80	8.01	95.49	37.96	84.73	7.96	95.49	37.84	84.32	8.37	95.49
	Wind speed (m/s)	0.98	1.99	0.54	6.60	0.98	1.99	0.55	6.59	0.98	2.01	0.56	6.60
	Wind direction (°)	35.79	108.32	42.72	288.55	36.15	108.20	42.71	287.71	35.70	108.01	42.53	288.51
	Preciptation (mm/day)	0.00	5.91	3.64	29.26	0.00	5.89	3.66	29.34	0.00	5.81	3.71	29.34
Northeast	Wildfire records	1	25.13	65.02	1,057	1	24.85	66.33	1,109	1	25.46	65.13	1,003
	PM2.5 (μg/m³)	2.02	18.51	23.50	217.43	2.10	18.77	23.54	229.87	2.06	18.71	23.49	213.52
	Temperature (°C)	19.20	25.95	1.84	31.76	19.33	26.03	1.82	31.77	19.27	26.02	1.84	31.87
	Relative humidity (%)	38.56	74.52	9.75	93.82	38.48	74.41	9.77	94.44	38.14	74.42	9.87	93.87
	Wind speed (m/s)	1.36	3.88	1.13	8.60	1.37	3.86	1.11	8.58	1.34	3.85	1.11	8.58
	Wind direction (°)	43.74	109.84	20.82	200.24	43.74	108.94	20.63	204.25	43.33	109.34	20.72	200.05
	Preciptation (mm/day)	0.00	3.22	2.85	18.21	0.00	3.22	2.78	18.73	0.00	3.27	2.79	18.73
Midwest	Wildfire records	0	14	100	4,116	0	14	105	5,622	0	14	115	5,642
	PM2.5 (μg/m³)	2.25	32.52	40.96	395.69	2.21	30.58	39.90	395.79	2.21	28.59	37.35	395.23
	Temperature (°C)	16.82	24.18	1.84	30.30	17.19	24.26	1.80	30.30	17.07	24.25	1.81	30.30
	Relative humidity (%)	37.73	67.06	10.86	95.39	37.85	67.46	10.80	95.39	37.74	67.35	11.06	95.39
	Wind speed (m/s)	1.13	2.53	0.41	4.39	1.13	2.52	0.41	4.39	1.13	2.52	0.41	4.33
	Wind direction (°)	88.38	142.62	28.63	291.61	88.18	143.55	29.12	291.28	88.38	143.40	29.12	289.44
	Preciptation (mm/day)	0.00	3.87	2.96	17.44	0.00	4.01	2.96	17.50	0.00	3.96	3.00	17.54
Southeast	Wildfire records	1	7	14	285	1	7	13	289	1	7	14	324
	PM2.5 (μg/m³)	2.64	26.45	19.38	120.58	2.81	26.70	20.66	119.24	2.64	26.82	21.33	121.48
	Temperature (°C)	14.47	21.72	2.38	27.92	14.85	21.95	2.31	27.76	14.58	21.95	2.33	27.87
	Relative humidity (%)	43.87	76.60	6.40	88.19	44.88	76.96	6.27	88.34	45.19	77.13	6.20	88.53
	Wind speed (m/s)	1.47	2.72	0.51	6.29	1.56	2.71	0.51	6.23	1.53	2.70	0.50	6.17
	Wind direction (°)	65.49	144.82	26.11	219.28	66.09	144.92	26.12	218.72	65.02	145.31	26.06	219.82
	Preciptation (mm/day)	0.00	3.72	2.46	16.74	0.00	3.95	2.47	13.90	0.00	3.89	2.49	16.10
South	Wildfire records	0	1	9	560	0	1	9	591	0	1	9	585
	PM2.5 (μg/m³)	4.03	25.67	20.53	171.03	4.07	23.69	19.69	174.59	4.04	21.45	17.11	171.03
	Temperature (°C)	10.80	19.47	3.30	27.32	11.33	19.71	3.17	27.24	11.33	19.66	3.19	27.29
	Relative humidity (%)	56.22	79.27	4.63	88.93	55.98	79.41	4.65	88.92	56.29	79.57	4.51	88.94
	Wind speed (m/s)	1.54	3.09	0.74	8.43	1.56	3.07	0.74	8.43	1.54	3.08	0.74	8.37
	Wind direction (°)	92.83	150.21	20.51	245.03	92.78	149.28	20.34	238.95	92.78	149.53	20.61	238.52
	Preciptation (mm/day)	0.10	4.43	1.63	16.20	0.14	4.46	1.64	16.20	0.14	4.41	1.63	16.09

Note: minimum (Min.), Standard Deviation (SD), maximum (Max.).