Hilo air quality.
Air quality observations and historical context for Hilo, HI
Historical perspective
The longer view.
Annual PM2.5 concentrations · µg/m³
View data table
| Year | PM2.5 |
|---|---|
| 2019 | 3.3 |
| 2020 | 3.6 |
| 2021 | 3.4 |
| 2022 | 3.4 |
| 2023 | 3.0 |
| 2024 | 2.6 |
Available history: 2019–2024. Historical scores are distinct from current AQI and do not describe today’s conditions.
Sources and scoring method ↗Local context
What this page tells you
This page combines annual PM2.5, unhealthy days, 5-year trend, and data coverage so you can compare long-term air quality, not just today's reading.
🌍 Live Air Quality in Hilo
Real-time pollutants resolved via none
Last 24 Hours: Hilo AQI Trend
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Live air quality data is currently unavailable for this specific location. You can check nearby cities below for representative regional readings.
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Regional Air Quality Context & Seasonal Patterns
Hilo is treated as a local community in HI, so the most useful signal is the long-term pollution baseline rather than a single live AQI reading. Annual PM2.5 averages 2.7 ug/m3, with roughly 0 unhealthy-air days per year, and the multi-year trend is improving. Its Clean Air Score is 89.7 (grade A), which helps compare Hilo with other HI cities. In Hilo, historical EPA observations show that pollution levels typically peak in January (averaging an index of 19), while the cleanest air conditions occur in November (averaging 10). With an extreme events rating of 100/100, Hilo exhibits resilient atmospheric ventilation with fewer multi-day smoke outliers. This report uses direct city-level monitor coverage where available, so the trend is tied closely to conditions in Hilo.
Winter (Temperature inversions & woodsmoke trapping)
Historically lowest pollution baseline
Fine particulate matter (PM2.5) in Hilo is monitored for health safety. Long-term exposure to pollutants can lead to respiratory issues, making daily checks essential for active residents in HI.
Looking for cleaner air near Hilo?
These destinations have significantly higher historical Clean Air Scores than Hilo (Score: 89.7).
Honolulu, HI
Anacortes, WA
Bremerton, WA
Indoor Air Quality in Hilo, HI
Outdoor pollution can still affect indoor air when windows are open, filtration is weak, or wildfire smoke moves in.
Complete Hilo Home AQI & Filtration Guide
Get custom room-by-room HEPA purifier sizing, seasonal PM2.5 trends, and local home sealing recommendations.
Usually safe to open windows for fresh air.
Air purifier is optional for most households.
Normal indoor and outdoor activity is fine.
Ventilate selectively; sensitive groups should watch symptoms.
Run HEPA filtration on low if pollen, smoke smell, or traffic exhaust is noticeable.
Most people can continue normal activity; sensitive groups should keep an eye on AQI.
Keep windows closed so outdoor PM2.5 does not build indoors.
Run HEPA filtration in bedrooms and main living spaces.
Children, older adults, and people with asthma should reduce outdoor exertion.
Keep windows and doors sealed as much as practical.
Run filtration continuously; use the highest comfortable fan setting.
Stay indoors when possible and consider an N95 if you must go outside.
🛒Top Air Purifiers & Filters for Hilo
Given Hilo's air quality profile and peak pollution season in January, maintaining certified HEPA filtration indoors is an effective defense against fine particulate matter.
Levoit Core 300 True HEPA Air Purifier
Compact, ultra-quiet (<24dB), budget-friendly replacement filters.
Check price on AmazonCoway Airmega 200M True HEPA Air Purifier
Wirecutter top pick: high airflow, eco mode, washable pre-filter.
Check price on AmazonBlueair Blue Pure 311i+ Max Air Purifier
Extra carbon filtration for wildfire smoke and VOCs, smart app enabled.
Check price on AmazonCoway Airmega 400 True HEPA Air Purifier
Dual-suction Max2 filter for high smoke/pollen exposure in open spaces.
Check price on AmazonAs an Amazon Associate, Clean Air Data earns from qualifying purchases. Prices and availability shown on Amazon at time of purchase. This does not affect our air quality data or recommendations.
Health Recommendations
Most people can continue outdoor activities normally. Keep an eye on changing conditions.
Children and elderly should reduce prolonged or heavy outdoor exertion if AQI rises above 50.
Running & Outdoor Exercise Guide
Explore available hourly data before planning outdoor time in Hilo.
Environmental Health Dossier: Air & Tap Water in Hilo
Atmospheric fine particulate matter (PM2.5) and municipal drinking water contaminants represent the two primary involuntary daily exposures in any household. While HEPA filtration purifies indoor air, municipal tap water often contains invisible halogenated byproducts, heavy metals, or PFAS forever chemicals.
Hilo holds a historical Clean Air Score of 89.7/100. High PM2.5 requires True HEPA (H13) physical media filters without electronic ozone generation.
Municipal utility compliance focuses on legal limits, not health guidelines. Verified solid-carbon or Reverse Osmosis filters target lead, chlorine byproducts, and micropollutants.
Compare Hilo Air Quality
See how Hilo’s pollution baselines and seasonal patterns compare side-by-side.
Frequently Asked Questions about Hilo Air Quality
Is air quality in Hilo safe today?
Current air quality in Hilo is being monitored. Based on historical data, Hilo has a clean air score of 89.7. For real-time updates, check the live monitoring panel on this page.
When is air pollution highest in Hilo?
According to multi-year EPA observations, air pollution in Hilo historically peaks during January (Winter (Temperature inversions & woodsmoke trapping)). The cleanest air window typically occurs in November.
What should sensitive groups do during peak air pollution in Hilo?
Keep home windows sealed during calm late evening hours when surface inversions concentrate particulates near ground level. Maintaining certified indoor HEPA filtration is an effective way to minimize personal exposure.
What is a dangerous AQI level?
An AQI (Air Quality Index) above 100 is considered unhealthy for sensitive groups, while levels above 150 are unhealthy for everyone. Levels above 300 are hazardous.
Should I wear a mask today in Hilo?
If the AQI in Hilo is above 150, an N95 mask is recommended for outdoor activities to filter out fine particulate matter (PM2.5).
Higher historical scores in HI
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