Is the Air Quality Good in Douglas, Nebraska?
Yes — air quality in Douglas, Nebraska is good. The city earns an Air Quality Grade of B (good) on a 5-year median AQI of 43, which sits in the Good range, and logs only 32 unhealthy-air days over five years (about 6 per year). The general population can breathe outdoors safely on the vast majority of days.
Who Can Safely Breathe the Air in Douglas, Nebraska?
For most healthy adults, current air quality in this area does not require any change in behavior. People with severe asthma, COPD, or recent cardiac events should still keep an eye on daily AQI alerts, especially during wildfire season. Because PM2.5 penetrates deep into the lungs and bloodstream, an N95 or KN95 mask provides meaningful protection on smoky or high-particulate days — surgical masks do not.
Across the past five years, this area has logged 32 days where AQI rose into the "Unhealthy for Sensitive Groups" range or worse — about 6 days per year. That is roughly typical for a U.S. metro, with most caution days clustered in summer (ozone) or wildfire season.
Douglas, Nebraska Air Quality Snapshot
| Air Quality Grade | B65/100 |
| 5-Year Median AQI | 43 (Good) |
| Most Recent Median AQI (2023) | 45 (Good) |
| Dominant Pollutant | Fine Particulate Matter (PM2.5) |
| 10-Year Trend | Improving (-0.62 AQI/yr) |
| Unhealthy Days (last 5 yr) | 32 |
| National Rank (cleanest = #1) | #631 of 1,020 (62th most polluted percentile) |
| Nebraska Rank | #9 of 9 |
What Does the B Grade Mean?
Douglas, Nebraska earns a B — air quality is reliably in the safe range for most residents most of the time, with a 5-year median AQI of 43. Sensitive groups will see occasional caution days, but the typical resident will not need to change behavior based on air quality.
Douglas, Nebraska's 5-year median AQI of 43 is right around the national average of 41 across the 1,020 monitored U.S. cities tracked here. Within Nebraska, Douglas, Nebraska runs more polluted than the state average of 30 — local sources or geography are concentrating pollution above the state's typical reading.
For context within Nebraska: Cass, Nebraska currently holds the state's cleanest grade (A, AQI 16), while Knox, Nebraska sits at the bottom (C, AQI 37).
What's in Douglas, Nebraska's Air?
The dominant pollutant in Douglas, Nebraska is Fine Particulate Matter (PM2.5). Fine particulate matter — particles less than 2.5 micrometers across — comes mostly from combustion: vehicle exhaust, wildfire smoke, residential wood burning, and industrial emissions. Because these particles are small enough to enter the bloodstream, PM2.5 is the pollutant most strongly linked to cardiovascular disease, respiratory illness, and premature death.
Days by Dominant Pollutant (2023)
| Pollutant | Days as Dominant | Share of Year |
|---|---|---|
| Ground-Level Ozone | 221 | 61% |
| Fine Particulate Matter (PM2.5) | 143 | 39% |
| Coarse Particulate Matter (PM10) | 1 | 0% |
Is the Air Getting Better or Worse?
Air quality in Douglas, Nebraska has been improving over the past decade, with median AQI dropping by roughly 0.6 points per year. That is consistent with the broader national pattern — most U.S. metros have seen steady reductions in particulate and ozone pollution since the 2010s as cleaner vehicles and power plants come online.
In 2014, Douglas, Nebraska posted a median AQI of 46. By 2023 that figure was 45 — a drop of 1 AQI points cleaner across 10 years of EPA records.
Year-by-Year AQI in Douglas, Nebraska
| Year | Median AQI | Good Days | Unhealthy Days | Dominant Pollutant |
|---|---|---|---|---|
| 2014 | 46 | 206 | 1 | PM2.5 |
| 2015 | 48 | 198 | 2 | PM2.5 |
| 2016 | 45 | 225 | 2 | PM2.5 |
| 2017 | 52 | 171 | 0 | PM2.5 |
| 2018 | 47 | 198 | 4 | PM2.5 |
| 2019 | 42 | 273 | 0 | PM2.5 |
| 2020 | 42 | 267 | 2 | PM2.5 |
| 2021 | 43 | 244 | 5 | PM2.5 |
| 2022 | 41 | 278 | 1 | Ozone |
| 2023 | 45 | 211 | 24 | Ozone |
How This Grade Is Calculated
The AirHistory Air Quality Grade combines four signals: the 5-year median AQI (40% of the score), the 10-year trend direction (30%), the count of unhealthy days per year (20%), and the dominant pollutant type (10%). All four come directly from the EPA Air Quality System (AQS), which aggregates readings from federally certified monitors. Read the full methodology.
More about Douglas, Nebraska
Douglas, Nebraska has an Air Quality Grade of B (good) with a 5-year median AQI of 43. The dominant pollutant is Fine Particulate Matter (PM2.5), and air quality has been improving over the past decade.
This answer pulls from the EPA Air Quality System (AQS), the authoritative federal source for U.S. air quality and pollution monitoring. The headline number above is the direct answer; what follows is the additional context most readers need to use the answer for a real decision rather than just a fact lookup.
For readers turning this answer into action: cross-reference against the underlying the EPA Air Quality System (AQS) record before acting on time-sensitive decisions. The site renders the data as it was published; subsequent revisions can shift the picture, and the live federal data is always the authoritative current reference.
Source: EPA Outdoor Air Quality Data, 2026.