Nassau, New York Air Quality
Nassau County, New York (NY)
↓ Improvingover 10 years
10-Year AQI Trend
The solid line shows the median AQI each year. The dashed line shows the 90th percentile (worst 10% of days). This area has seen measurable air quality improvement over the decade.
Air Quality Day Breakdown
Number of days per year in each EPA AQI category. Green = Good (AQI 0-50), Yellow = Moderate (51-100), Orange = Unhealthy for Sensitive Groups (101-150), Red = Unhealthy or worse (151+).
Year-by-Year Data
| Year | Median AQI | 90th Pct | Max AQI | Good Days | Moderate | Unhealthy+ | Pollutant |
|---|---|---|---|---|---|---|---|
| 2023 | 31 | 57 | 197 | 275 | 86 | 4 | PM2.5 |
| 2022 | 29 | 53 | 68 | 303 | 58 | 0 | PM2.5 |
| 2021 | 32 | 54 | 118 | 291 | 68 | 1 | PM2.5 |
| 2020 | 27 | 52 | 75 | 317 | 44 | 0 | PM2.5 |
| 2019 | 29 | 53 | 72 | 308 | 52 | 0 | PM2.5 |
| 2018 | 28 | 54 | 93 | 305 | 60 | 0 | PM2.5 |
| 2017 | 32 | 55 | 68 | 277 | 70 | 0 | PM2.5 |
| 2016 | 30 | 56 | 72 | 278 | 77 | 0 | PM2.5 |
| 2015 | 34 | 59 | 80 | 256 | 106 | 0 | PM2.5 |
| 2014 | 36 | 58 | 79 | 260 | 99 | 0 | PM2.5 |
What This Means for Nassau County Residents
Nassau, New York has received an Air Quality Grade of B (73/100) based on a decade of EPA monitoring data. The current median AQI of 31 falls in the "Good" range.
Encouragingly, air quality here has been improving, with the median AQI dropping by 5 points over the monitoring period. This trend suggests continued investment in emission controls and cleaner energy.
The primary pollutant affecting this area is Fine Particulate Matter (PM2.5). Over the past 5 years, this area has averaged 1 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity.