Metro area air quality · 2025

Hammond, LA

Median AQI 41 (Good). 79.5% of monitored days rated Good across this metro's EPA monitoring network.

Compiled by PlainAirData · August 23, 2026

41
Median AQI: 79.5%
Good-air days: 0
Unhealthy days: 66%
Cleaner than US metros

Hammond, LA posted a 2025 median AQI of 41 (Good) with 79.5% Good days

According to the U.S. EPA Air Quality System, the Hammond, LA CBSA recorded a median AQI of 41 across 122 monitored days in 2025, with 79.5% rated Good and 0 unhealthy or worse. This is an annual metro comparison, not a live advisory.

Data source EPA Air Quality System (AQS)

Cleaner than US metros: The Hammond, LA CBSA's 79.5% Good-day share places it cleaner than 66% of US metros in 2025.
Closest median-AQI peer: Adrian, MI (69.3% Good, median AQI 41) is the closest nationwide median-AQI peer to Hammond, LA.
2020–2025 Good-day shift: Hammond, LA's Good-day share moved +6.8 points from 2020 to 2025 (median AQI +7).
Median AQI: Median AQI: 41

Aggregated from EPA Air Quality System (2025), 122 monitored days. EPA AQS →

The verdict

Hammond, LA's peak reading 64 stays in the lower max-AQI tercile on this extract. On the EPA scale the metro runs good, cleaner than the median US metro, with a median AQI of 41 and 79.5% of 122 monitored days in the Good band.

41
median AQI · Good: 79.5%
days rated Good: 66%
cleaner than US metros: 64
worst single reading

No day crossed into the Unhealthy tier across the metro's monitors in 2025.

Hammond, LA metro's Good-day share rose from 52.8% to 79.5% between the 2024 and 2025 EPA annual releases, a change of +26.8 percentage points.
Hammond, LA metro's median AQI fell from 47 to 41 between the 2024 and 2025 EPA annual releases, a change of -6 points.
Hammond, LA metro's peak single-day AQI fell from 77 to 64 between the 2024 and 2025 EPA annual releases, a change of -13 points.

Hammond, LA's peak reading 64 stays in the lower max-AQI tercile on this extract. Signature read: peak AQI 64 (low tercile vs CBSA corpus). Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 41 over 122 measured days in 2025 (Good / Good). The monitored-day split lands at 97 Good (80%), 25 Moderate (20%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 53; the highest single-day reading hit 64 (Moderate).

Across 2020–2025, Good-day share shifted +6.8 points and median AQI moved +7 (improving). No Unhealthy-tier days appear in this annual dataset. Metros with comparable AQI profiles include Adrian, MI (69.3% good, AQI 41); Albany-Schenectady-Troy, NY (67.7% good, AQI 41); Ann Arbor, MI (69.3% good, AQI 41).

Understanding AQI →

Air Quality Summary

Median AQI

Good

Good Days

79.5%

97 of 122 days

Max AQI

Moderate

Health Grade

Good

90th pct: 53

AQI Day Breakdown (2025)

Distribution of 122 monitored days across EPA AQI categories.

Good

80%

Moderate

20%

USG

Unhealthy

Very Unhealthy

Hazardous

Health Impact Assessment

Good

The Hammond, LA metro area's air quality is rated Good based on 79.5% good air days. No unhealthy air days were recorded in 2025.

Air quality is generally acceptable. Unusually sensitive people should monitor real-time conditions at AirNow.gov during high-pollution events.

How does the Hammond, LA metro compare?

How Hammond, LA compares

Compare against

Good-day share better than typical

Hammond, LA 79.5%

Adrian, MI 69.3%

Typical US metro 70.6%

Median AQI about typical

Hammond, LA 41

Adrian, MI 41

Typical US metro 41

Unhealthy days / yr better than typical

Hammond, LA 0

Adrian, MI 0

Typical US metro 1

5-Year Air Quality Trend

Air quality is improving in the Hammond, LA metro. Highest Good-day share: 2025 (79.5%, 97 of 122 monitored days).

Year	Good	Moderate	Median AQI	Max AQI
2020	88	33	34	68
2021	81	29	39	65
2022	89	35	38	97
2023	81	43	43	71
2024	67	60	47	77
2025	97	25	41	64

Metros with a similar median AQI

CBSA peers nationwide whose annual median AQI sits near Hammond, LA (41).

Adrian, MI

Median AQI 41 · 69.3% Good-day share

Albany-Schenectady-Troy, NY

Median AQI 41 · 67.7% Good-day share

Ann Arbor, MI

Median AQI 41 · 69.3% Good-day share

Bowling Green, KY

Median AQI 41 · 75.6% Good-day share

Brunswick, GA

Median AQI 41 · 74.3% Good-day share

Decatur, AL

Median AQI 41 · 78.4% Good-day share

Metros with similar unhealthy-day exposure

A second relationship type: metros whose unhealthy-or-worse day count is closest to Hammond, LA's 0 (independent of median AQI).

Aberdeen, SD

0 unhealthy-or-worse days · median AQI 27

Aberdeen, WA

0 unhealthy-or-worse days · median AQI 22

Akron, OH

0 unhealthy-or-worse days · median AQI 45

Albany, GA

0 unhealthy-or-worse days · median AQI 46

Albany, OR

0 unhealthy-or-worse days · median AQI 27

Alexandria, LA

0 unhealthy-or-worse days · median AQI 37

Frequently Asked Questions

What is the 90th percentile AQI for Hammond, LA? ▼

The 90th percentile AQI for the Hammond, LA metro area is 53, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 64 (Moderate).

How many unhealthy air days does Hammond, LA have? ▼

In 2025, the Hammond, LA metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 64.

What is the air quality in the Hammond, LA metro area? ▼

The Hammond, LA metro area has a median Air Quality Index (AQI) of 41, rated "Good." 79.5% of monitored days (97 out of 122) had good air quality in 2025.

Is air quality in Hammond, LA getting better or worse? ▼

Air quality in the Hammond, LA metro is improving across floor-qualifying years (2020-2025); years with fewer than 100 monitored days are excluded from that direction. Highest qualifying Good-day share: 2025 at 79.5% (97 of 122 days). Lowest qualifying Good-day share: 2024 at 52.8% (67 of 127 days).

What does AQI 41 mean for health? ▼

An AQI of 41 is "Good", air quality is satisfactory and poses little or no health risk. This is the best category on the EPA's AQI scale.

How does Hammond, LA compare to other metro areas? ▼

The Hammond, LA metro has 79.5% good air days. Similar metros: Adrian, MI (69.3% good), Albany-Schenectady-Troy, NY (67.7% good), Ann Arbor, MI (69.3% good).

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset for Hammond, LA, 2025. See our methodology for how AQI, median, and coverage figures are computed.

Read our methodology , how this data is sourced, computed, and verified.

Source: U.S. EPA Air Quality System (AQS) Annual AQI by CBSA summary, Hammond, LA · 2020–2025 Accessed 2026-07-06