Days Exceeding Ozone and Particulate Standards – 2023 | Santa Barbara County Air Pollution Control District

These summaries are not updated in real time. Data will be posted as soon as compiled. Data are preliminary and subject to change. For statewide information by zip code or city name, see EPA’s AirNow web page.

2023 Summary

Standard	Limit	# of Days Exceeding	Year to Date Max
Ozone 1-hour State Standard	94 ppb	0
Ozone 8-hour Federal Standard	70 ppb	0
Ozone 8-hour State Standard	70 pbb	0
Particulate Matter PM10 24-hour State Standard	50 ug/m3	12	115 ug/m3
Particulate Matter PM10 24-hour Federal Standard	154 ug/m3	0
Particulate Matter PM2.5 24-hour Federal Standard	35 ug/m3	0

2023 Days Exceeding the State 24-hour PM10 Standard

Count	Date	Daily Max	Goleta	Las Flores Cyn	Lompoc H St	Santa Barbara	Santa Maria
1	2-14-23	69	23	33	42	20	69
2	2-21-23	115	32	24	29	47	115
3	4-3-23	86	16	20	34	19	86
4	6-20-23	54	23	24	30	24	54
5	8-29-23	57	34	26	52	40	57
6	8-30-23	53	33	27	44	39	53
7	9-21-23	52	37	34	52	39	50
8	9-26-23	75	18	24	24	26	75
9	9-27-23	77	22	27	35	28	77
10	10-11-23	56	33	35	37	41	56
11	10-12-23	56	44	50	31	56	39
12	10-29-23	62	25	29	27	30	62

Notes:

For the current year, see Exceedances.
For other previous years, see 2024, 2022, 2021, 2020, 2019, 2018, 2017, 2016 or 2015-1998.

Ozone 8 hour Averages Although the federal and state 8-hour average ozone standards are both set at 70 ppb, recorded levels for the state standard are rounded to the nearest whole number, while levels for the federal standard are truncated to the nearest whole number. For example, a value of 71.6 would be rounded to 72 for the state standard and truncated to 71 for the federal standard.

Particulate Matter PM10 is calculated different when being compared to the state standard versus the federal standard. The PM10 state 24 hour value is a rounded average of the monitors 24 hourly readings in a day using local ambient temperature and pressure conditions. The PM10 federal 24 hour value is a truncated average of the monitors 24 hourly readings in a day using standardized temperature and pressure conditions. This difference results in slightly different 24 hour averages for each monitoring station on a given day.