What is the air quality trend in Menlo Park?

Over the past 15 days, Menlo Park had an average AQI of 26 based on station measurements. The worst day was 2026-05-21 with AQI 40.

How is Menlo Park air quality measured?

Air quality in Menlo Park is measured by ground-level monitoring stations that report PM2.5 and PM10 concentrations hourly. CERNS.IO aggregates readings from nearby stations and converts PM2.5 to the US EPA Air Quality Index (AQI) scale.

Air Quality History for Menlo Park, United States

Name: Menlo Park Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near Menlo Park, United States.

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

335h

PM2.5 Station

335h · 1 station

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-05-29	19	8–23	4.5 µg/m³	4.3	16h	94
2026-05-28	24	15–66	6.0 µg/m³	3.7	24h	98
2026-05-27	21	20–25	5.0 µg/m³	3.2	24h	108
2026-05-26	21	15–28	5.0 µg/m³	3.8	24h	109
2026-05-25	18	15–23	4.4 µg/m³	1.8	24h	107
2026-05-24	21	18–24	4.9 µg/m³	1.4	24h	108
2026-05-23	25	23–30	6.0 µg/m³	2.9	24h	109
2026-05-22	31	27–40	7.4 µg/m³	4.1	24h	104
2026-05-21	40	32–46	9.6 µg/m³	13.0	24h	109
2026-05-20	36	25–40	8.6 µg/m³	11.4	24h	109
2026-05-19	28	17–34	6.6 µg/m³	13.5	24h	108
2026-05-18	19	16–37	4.5 µg/m³	4.1	24h	107
2026-05-17	34	27–38	8.1 µg/m³	7.6	24h	108
2026-05-16	35	29–42	8.5 µg/m³	8.9	24h	107
2026-05-15	32	30–32	7.6 µg/m³	5.8	7h	108

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