Days Exceeding Ozone and Particulate Standards – 2024 | 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.

2024 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	1	73 ppb
Ozone 8-hour State Standard	70 ppb	1	73 ppb
Particulate Matter PM₁₀24-hour State Standard	50 ug/m³	15	79 ug/m³
Particulate Matter PM₁₀ 24-hour Federal Standard	154 ug/m³	0
Particulate Matter PM_2.5 24-hour Federal Standard	35 ug/m³	0

2024 Days Exceeding the Federal 8-hour Ozone Standard

Count	Date	Daily Max	Carp	Goleta	Las Flores Cyn	Lompoc HS&P	Lompoc H St	Paradise Rd	Santa Barbara	Santa Maria	Santa Ynez
1	6-22-24	73	22	31	41	N/A	28	73	32	29	50

2024 Days Exceeding the State 8-hour Ozone Standard

Count	Date	Daily Max	Carp	Goleta	Las Flores Cyn	Lompoc HS&P	Lompoc H St	Paradise Rd	Santa Barbara	Santa Maria	Santa Ynez
1	6-22-24	73	22	31	41	N/A	28	73	32	29	50

2024 Days Exceeding the State 24-hour PM10 Standard

Count	Date	Daily Max	Goleta	Las Flores Cyn	Lompoc H St	Santa Barbara	Santa Maria
1	4-26-24	59	13	11	16	24	59
2	4-27-24	70	15	12	21	21	70
3	4-29-24	66	24	26	32	28	66
4	4-30-24	74	34	31	40	38	74
5	5-1-24	56	28	31	40	36	56
6	6-15-24	79	32	40	43	35	79
7	6-16-24	59	39	35	42	44	59
8	6-17-24	56	35	N/A	32	37	56
9	6-18-24	56	31	27	34	34	56
10	9-11-24	56	19	26	23	21	56
11	9-17-24	52	52	15	17	21	37
12	10-18-24	56	22	27	34	22	56
13	10-20-24	56	19	21	29	22	56
14	10-28-24	69	21	13	20	34	69
15	11-7-24	51	30	36	51	31	41

Notes:

For the current year, see Exceedances.
For other previous years, see 2023, 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 averages are calculated differently for the state and federal standards. The state 24-hour PM₁₀ value is a rounded average of the monitor’s 24 hourly readings in a day using local ambient temperature and pressure conditions. Whereas the federal 24-hour PM₁₀ value is a truncated average of the monitor’s 24 hourly readings in a day using standardized temperature and pressure conditions. These calculation methods result in slightly different 24-hour averages for each monitoring station on a given day.