Tehama, California Air Quality

Tehama County, California (CA)

→ Stableover 10 years

Air Quality Grade

57/100

Current Median AQI

Good

5-Year Avg AQI

-1

10-Year Change

Better

Unhealthy Days/yr

5-year average

Ozone

Primary Pollutant

Ground-Level Ozone

10-Year AQI Trend

The solid line shows the median AQI each year. The dashed line shows the 90th percentile (worst 10% of days).

Air Quality Day Breakdown

Number of days per year in each EPA AQI category. Green = Good (AQI 0-50), Yellow = Moderate (51-100), Orange = Unhealthy for Sensitive Groups (101-150), Red = Unhealthy or worse (151+).

Year-by-Year Data

Year	Median AQI	90th Pct	Max AQI	Good Days	Moderate	Unhealthy+	Pollutant
2023	44	67	136	242	117	6	Ozone
2022	44	74	108	245	117	3	Ozone
2021	47	100	193	207	122	36	Ozone
2020	46	94	218	216	117	33	Ozone
2019	43	64	93	263	102	0	Ozone
2018	48	96	206	208	128	29	Ozone
2017	42	77	172	237	119	9	Ozone
2016	45	108	174	218	106	42	Ozone
2015	47	87	154	223	123	19	Ozone
2014	45	80	151	227	121	16	Ozone

What This Means for Tehama County Residents

Tehama, California has received an Air Quality Grade of C (57/100) based on a decade of EPA monitoring data. The current median AQI of 44 falls in the "Good" range.

The primary pollutant affecting this area is Ground-Level Ozone. Over the past 5 years, this area has averaged 16 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity.