Bronx, New York Air Quality
Bronx has a median AQI of 47, earning an air quality grade of B+ — good air quality that ranks better than 21% of US cities. Air quality has remained relatively stable over the past decade. Particulate matter (PM2.5) is the primary concern, often linked to vehicle traffic, industrial activity, and wildfire smoke. In 2025, Bronx recorded 155 good air quality days (57% of monitored days) and 8 unhealthy days.
Population: 1,472,654 • County: Bronx
Current AQI
Quick Facts
| Current AQI | 13 — Good |
| Air Quality Grade | B+ |
| Median AQI (2025) | 47 |
| vs. U.S. Cities | Better than 21% |
| Primary Pollutant | PM2.5 |
| Unhealthy Days/Year | 8 |
| 10-Year Trend | → Stable |
| 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 Bronx is sourced from the Bronx - IS74 monitoring area, located approximately 3 miles from city center. This EPA-certified station continuously tracks particulate matter (PM2.5), the primary driver of air quality alerts in this area.
Bronx tends to see elevated PM2.5 readings during fall and winter months when temperature inversions trap pollutants near the surface. Wood burning, vehicle exhaust, and reduced wind speeds compound the effect. Residents with respiratory conditions should monitor forecasts closely between November and February.
AQI Trend (10 Years)
Air Quality Days by Year
Bronx Median AQI by Year
Annual EPA air quality data for Bronx — median AQI, day-category breakdown, and primary pollutant per year.
| Year | Median AQI | Good Days | Unhealthy Days | Max AQI | Primary Pollutant |
|---|---|---|---|---|---|
| 2025 | 47 | 155 | 8 | 143 | PM2.5 |
| 2024 | 42 | 246 | 2 | 150 | PM2.5 |
| 2023 | 47 | 197 | 9 | 253 | PM2.5 |
| 2022 | 44 | 225 | 1 | 101 | PM2.5 |
| 2021 | 47 | 214 | 8 | 156 | PM2.5 |
| 2020 | 45 | 229 | 1 | 108 | PM2.5 |
| 2019 | 46 | 212 | 3 | 115 | PM2.5 |
| 2018 | 44 | 229 | 9 | 150 | PM2.5 |
| 2017 | 44 | 241 | 2 | 136 | PM2.5 |
| 2016 | 45 | 226 | 4 | 140 | PM2.5 |
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 Bronx Air Quality
What is the air quality in Bronx today?
The current AQI in Bronx is 13, 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 Bronx getting better or worse?
Air quality in Bronx has been stable. The median AQI has risen 2 points (from 45 in 2016 to 47 in 2025).
What is the most common air pollutant in Bronx?
PM2.5 is the primary air pollutant in Bronx, responsible for 160 days (58% of monitored days) in 2025. Particulate matter originates from vehicle exhaust, wildfires, construction, and industrial activity.
How many unhealthy air days does Bronx have per year?
In 2025, Bronx recorded 57% good air quality days (155 days) out of 274 monitored days. There were 8 Unhealthy for Sensitive Groups days and 0 Unhealthy days (AQI above 100). The highest single-day AQI recorded was 143.
What air quality grade does Bronx receive?
Bronx receives an air quality grade of B+, placing it better than 21% of US cities. This is based on a median AQI of 47 in 2025, with 155 good air quality days. The EPA monitors air quality in this area continuously using certified monitoring stations.
Air Quality Grade
Better than 21% of US cities
Nearby Cities
Get AQI Alerts
Receive notifications when air quality changes in Bronx
National Rankings
See how Bronx compares to every other US city by air quality.
Best Air Quality Cities →All city rankingsRecommended Air Purifiers for Bronx
Bronx sees its worst PM2.5 during winter temperature inversions when particulates get trapped near ground level. A unit with True HEPA and an auto-mode sensor is most effective for responding to these spikes.
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