Twin Lakes, California Air Quality
Twin Lakes has a median AQI of 22, earning an air quality grade of A+ — excellent air quality that ranks better than 92% of US cities. Air quality has been trending worse over the past decade, a concern for local residents and health officials. Particulate matter (PM2.5) is the primary concern, often linked to vehicle traffic, industrial activity, and wildfire smoke. In 2025, Twin Lakes recorded 168 good air quality days (93% of monitored days) and 1 unhealthy days.
0Current AQI
Quick Facts
| Current AQI | 18 — Good |
| Air Quality Grade | A+ |
| Median AQI (2025) | 22 |
| vs. U.S. Cities | Better than 92% |
| Primary Pollutant | PM2.5 |
| Unhealthy Days/Year | 1 |
| 10-Year Trend | ↓ Worsening |
| Data Source | EPA AQS (historical) · AirNow (live) |
Health Recommendation
Air quality is satisfactory, and air pollution poses little or no risk.
It's a great day to be active outside!
5-Day AQI Forecast
Last 90 Days
Current Pollutant Levels
Real-time data from EPA AirNow
Local Air Quality Context
Air quality data for Twin Lakes is sourced from the Lee Vining monitoring area, located approximately 19 miles from city center. This EPA-certified station continuously tracks particulate matter (PM2.5), the primary driver of air quality alerts in this area.
Wildfire smoke is a significant factor in Twin Lakes's air quality, with regional fires capable of pushing AQI from Good to Unhealthy within hours during fire season (typically July through October). On smoke-impacted days, staying indoors with windows closed and running an air purifier with a HEPA filter is the most effective protection.
AQI Trend (10 Years)
Air Quality Days by Year
Twin Lakes Median AQI by Year
Annual EPA air quality data for Twin Lakes — median AQI, day-category breakdown, and primary pollutant per year.
| Year | Median AQI | Good Days | Unhealthy Days | Max AQI | Primary Pollutant |
|---|---|---|---|---|---|
| 2025 | 22 | 168 | 1 | 104 | PM2.5 |
| 2024 | 19 | 341 | — | 69 | PM2.5 |
| 2023 | 24 | 325 | 5 | 1829 | PM2.5 |
| 2022 | 27 | 276 | 28 | 8368 | PM2.5 |
| 2021 | 27 | 260 | 26 | 2971 | PM2.5 |
| 2020 | 51 | 183 | 66 | 2088 | PM2.5 |
| 2019 | 34 | 242 | 15 | 4227 | PM2.5 |
| 2018 | 27 | 252 | 29 | 1049 | PM2.5 |
| 2017 | 18 | 300 | 25 | 3767 | PM10 |
| 2016 | 18 | 312 | 33 | 7063 | PM10 |
Source: EPA Air Quality System (AQS) annual summaries. "Unhealthy Days" includes Unhealthy for Sensitive Groups, Unhealthy, Very Unhealthy, and Hazardous categories.
2025 Air Quality Summary
Primary Pollutant Days (2025)
Days when each pollutant was the primary driver of AQI. Learn about pollutants →
Frequently Asked Questions About Twin Lakes Air Quality
What is the air quality in Twin Lakes today?
The current AQI in Twin Lakes is 18, rated "Good". Air quality is good — outdoor activity is safe for everyone today. Air quality is satisfactory, and air pollution poses little or no risk.
Is air quality in Twin Lakes getting better or worse?
Air quality in Twin Lakes has been worsening. The median AQI has risen 4 points (from 18 in 2016 to 22 in 2025), a concern for local health officials.
What is the most common air pollutant in Twin Lakes?
PM2.5 is the primary air pollutant in Twin Lakes, responsible for 94 days (52% of monitored days) in 2025. Particulate matter originates from vehicle exhaust, wildfires, construction, and industrial activity.
How many unhealthy air days does Twin Lakes have per year?
In 2025, Twin Lakes recorded 93% good air quality days (168 days) out of 181 monitored days. There were 1 Unhealthy for Sensitive Groups days and 0 Unhealthy days (AQI above 100). The highest single-day AQI recorded was 104.
What air quality grade does Twin Lakes receive?
Twin Lakes receives an air quality grade of A+, placing it better than 92% of US cities. This is based on a median AQI of 22 in 2025, with 168 good air quality days. The EPA monitors air quality in this area continuously using certified monitoring stations.
Air Quality Grade
Better than 92% of US cities
Nearby Cities
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National Rankings
See how Twin Lakes compares to every other US city by air quality.
Best Air Quality Cities →All city rankingsRecommended Air Purifiers for Twin Lakes
Twin Lakes faces elevated PM2.5 from wildfire smoke in addition to year-round traffic and industrial sources. We prioritize True HEPA units with high smoke CADR — essential for rapid air cleaning during smoke events.
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