Reno Median AQI 2021: Historical Air Quality Data
Explore 2021 air quality data for Reno, including the median AQI, seasonal patterns, pollution trends, and how air quality changed over the year.
Current Air Quality
Air quality is satisfactory, and air pollution poses little or no risk.
Reno Air Quality in 2021
Historical air quality data for Reno in 2021 shows how pollution levels have changed over time. Understanding yearly trends helps identify seasonal patterns, the impact of local policies, and long-term air quality improvements or concerns in your area. Check current conditions below for today's AQI reading.
View Current Reno Air Quality →Reno 2021 Air Quality Snapshot
Across 2021, Reno's median AQI was around 46 (Good), based on current readings and seasonal patterns for the Reno-Sparks reporting area. That means a typical day fell near AQI 46, with the dominant pollutant being ground-level ozone (O3), which is common for the Southwest region.
How Reno Air Quality Changed by Season in 2021
Spring (Mar–May): Usually Reno's cleanest stretch, with AQI near 28. Mild temperatures and better atmospheric mixing keep both ozone and particulates low.
Summer (Jun–Aug): AQI climbs toward 70 as heat and sunlight drive ozone formation to its yearly peak. Afternoons are the worst time to be outside.
Fall (Sep–Nov): Air quality generally improves as temperatures drop, though early fall can still carry wildfire smoke in the Southwest region.
Winter (Dec–Feb): AQI near 48. Cold-air temperature inversions can trap PM2.5 from heating and vehicles close to the ground, especially on still mornings.
Is It Safe to Exercise Outside in Reno?
With Reno's AQI at 42 (Good), outdoor exercise is generally safe for most people. Conditions are good for running, cycling, and outdoor sports at any time of day.
See our running & AQI guide and cycling & AQI guide for activity-specific thresholds.
What's Causing Reno's Air Pollution?
In Reno, the leading pollutant is ground-level ozone (O3). As part of the Southwest region, the main drivers of air pollution here are:
- •Windblown dust and periodic dust storms (haboobs)
- •Vehicle emissions intensified by extreme summer heat
- •Rapid construction from population growth
- •Ground-level ozone formed in strong desert sunlight
Dig deeper: Reno PM2.5 levels · Reno ozone levels
Air Purifier & Monitor Buying Guides
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PM2.5 Levels
Fine particulate matter data →
Ozone Levels
Ground-level ozone data →
Seasonal Guides
Air quality by season →
Health Effects
Learn about air pollution impacts →
Frequently Asked Questions About Reno Air Quality
What is the current air quality in Reno?
The current Air Quality Index (AQI) in Reno, NV is 42, which is considered good.
Is it safe to exercise outdoors in Reno?
Yes, with an AQI of 42, outdoor exercise is safe for everyone in Reno.
When is the best time of year to visit Reno for good air quality?
Spring and early fall typically offer the best air quality in Reno. Summer months may have elevated ozone levels, while winter can see higher PM2.5 from temperature inversions.
What causes air pollution in Reno?
Air pollution in Reno can come from vehicle emissions, industrial activity, construction, wildfires, and weather patterns. Local geography and seasonal factors also play a significant role.
Explore More Air Quality Data
Reduce Indoor Ozone in Reno
Today's main pollutant in Reno is ground-level ozone (AQI 42). Important: standard HEPA filters do NOT remove ozone — only a purifier with a substantial activated-carbon bed adsorbs it. The biggest wins are cutting indoor sources (gas appliances, certain "ionizer" purifiers) and ventilating when outdoor ozone is low (early morning). A high-carbon unit helps with the gases and VOCs that linger indoors.
Compare activated-carbon purifiers (for gases & ozone):
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