Idaho · AirNow reporting area

Twin Falls, ID air quality

The Air Quality Index in Twin Falls is 27 (Good) as of 4:00 AM MDT on Wed, Oct 28, with Fine particles (PM2.5) as the main pollutant. Today's forecast: AQI 19, Good (PM2.5). Tomorrow: Good (PM2.5). Preliminary data from the EPA AirNow program, reported by Idaho Department of Environmental Quality.

Updated Oct 28, 2026, 6:12 AM EDT (snapshot)

Current AQI

AQI now

27Good

4:00 AM MDT, Wed, Oct 28

By pollutant

PM2.5: 27Good

Yesterday's highest AQI

24Good

PM2.5, Tue, Oct 27

What this AQI means for your health

Good (AQI 0–50). Air pollution is low and is not expected to affect health. A good day to be active outside.

These are general guidelines based on EPA's AQI categories, written in our own words. See the full AQI scale.

Air quality forecast

Daily AQI forecast issued by Idaho Department of Environmental Quality. Some areas forecast a category without a number.

AQI forecast for Twin Falls
Day	Forecast	Pollutants
Today, Wed, Oct 28	19Good	PM2.5 19
Tomorrow, Thu, Oct 29	Good	PM2.5 Good
Fri, Oct 30	Good	PM2.5 Good
Sat, Oct 31	Good	PM2.5 Good

Monitor readings

Latest hourly NowCast AQI at 1 monitor assigned to or near this area. NowCast weighs recent hours more heavily so it reacts faster to changes. Distance is from the area's center point.

Monitors for Twin Falls (hour starting, local time)
Monitor	Hour	PM2.5 AQI	Ozone AQI	PM10 AQI	PM2.5 µg/m³	Miles
Twin Falls PM25	3 AM	27	—	—	5	2

Last 12 hours

Highest hourly NowCast AQI among the monitors above, for each hour (MDT).

Hourly AQI, highest monitor
Hour starting	PM2.5 AQI	Ozone AQI	PM10 AQI	Monitors
3 AM	27	—	—	1
2 AM	27	—	—	1
1 AM	27	—	—	1
12 AM	21	—	—	1
11 PM	19	—	—	1
10 PM	22	—	—	1
9 PM	27	—	—	1
8 PM	32	—	—	1
7 PM	30	—	—	1
6 PM	16	—	—	1
5 PM	16	—	—	1
4 PM	16	—	—	1

Hourly monitor values from AirNow HourlyAQObs files, latest hour Oct 28, 2026, 5:00 AM EDT. Single-hour readings can be missing or revised.

Protecting yourself on bad air days

When the AQI is high, spend less time being active outdoors, keep windows closed if the outdoor air is worse than indoors, and run a portable HEPA air cleaner or your central system with a high-efficiency filter (MERV 13 or higher if your system can handle it). When fine particles or smoke are the problem, a well-fitted N95 respirator gives much better protection than a cloth or surgical mask. Read more on our wildfire smoke page.

Shopping for an air cleaner? Compare air purifiers on OpenPicks, our sister site.

Nearby areas

Craters of the Moon National Monument, ID

28Good

76 miles away

Ketchum, ID

4Good

77 miles away

Pocatello, ID

36Good

104 miles away

Idaho City, ID

21Good

112 miles away

Boise, ID

34Good

116 miles away

Garden Valley, ID

8Good

131 miles away

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Sources

Current AQI, yesterday's maximum and forecasts: U.S. EPA AirNow reporting area file (files.airnowtech.org), as of Oct 28, 2026, 6:12 AM EDT.
Monitor readings: AirNow HourlyAQObs files (hourly NowCast AQI and raw concentrations).
Reporting agencies: Idaho Department of Environmental Quality; National Park Service. These agencies own the data and are the authority for forecasts and advisories.
Values are shown as received from AirNow. See AirNow partners for the full list of agencies.

Preliminary data. AirNow readings and forecasts come from federal, state, local and tribal air quality agencies. They are not fully verified, may change, and must not be used for regulatory or official decisions; official data are in EPA's Air Quality System. For the latest official readings and advisories, check AirNow.gov and your state or local air agency.

This page is general information, not medical advice. If you have symptoms or a health condition, follow your doctor's guidance.