Median AQI
47
Good
New York · County air quality · 2025
Bronx County, New York
Median AQI 47 (Good). 56.6% of monitored days rated Good, direct from EPA Air Quality System stations.
- 47
- Median AQI
- 56.6%
- Good-air days
- 0
- Unhealthy days
- 11%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Bronx County's air is good on balance, among the more polluted 10% of US counties, a median AQI of 47 with 56.6% of 274 monitored days in the Good band, driven mainly by PM2.5.
- 47
- median AQI · Good
- 56.6%
- days rated Good
- PM2.5
- main pollutant
- 11%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 143.
Data updated July 2026
- Good · 155 d · 56.6%
- Moderate · 111 d · 40.5%
- USG · 8 d · 2.9%
How did Bronx County's air break down in 2025?
Across 274 monitored days, 155 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 143 (USG).
EPA AQS →Air quality data from EPA Air Quality System (2025). 274 days monitored. Median AQI: 47 (Good).
Insights: Bronx County, New York. EPA monitors recorded a median Air Quality Index of 47 across 274 measured days in 2025, earning a Good classification and a Moderate health grade. Of those days, 155 (57%) fell in the Good band (AQI 0–50), 111 (41%) registered Moderate readings, and 8 (3%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 67, while the worst single-day peak hit 143 (USG). Residents averaged about 17.0 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM2.5 (160 days), Ozone (90 days), NO2 (23 days), CO (1 days). Across the 2020–2025 trend window, good days shifted by -74 and the median AQI moved +2 points, placing the multi-year trajectory at worsening. The worst single reading over the 2020–2025 window was AQI 143, usg but never Unhealthy. Nearby counties show comparable readings: Albany (67.4% good, AQI 39); Chautauqua (88.6% good, AQI 39); Dutchess (92.7% good, AQI 37); Erie (61.3% good, AQI 44); Essex (79.8% good, AQI 42); Hamilton (96.6% good, AQI 36).
Air Quality Summary
Good Days
56.6%
155 of 274 monitored days
-18.4pp vs 75% target
Max AQI Recorded
143
USG
Health Grade
Moderate
90th-pct AQI 67
Bronx County, Good days share 56.6%
National avg
Share of monitored days at AQI 0-50 (Good band).
Bronx County, Unhealthy-or-worse share 0.0%
National avg
Share of monitored days above AQI 150 (Unhealthy or worse). Bar maxes at 10% (worst-county ceiling).
AQI Day Breakdown (2025)
Distribution of 274 monitored days across EPA AQI categories.
Good
155
57%
Moderate
111
41%
USG
8
3%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Bronx County.
- PM2.5 · 160 days · 58.4%
- Ozone · 90 days · 32.8%
- NO₂ · 23 days · 8.4%
- CO · 1 days · 0.4%
Health Impact Assessment
Moderate
Bronx County's air quality is rated Moderate based on 56.6% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 56.6% of monitored days in 2025, with a median AQI of 47. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is PM2.5, driving AQI on 160 of 274 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Bronx County. Best year: 2024 (246 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 229 | 136 | 1 | 0 | 45 | 108 |
| 2021 | 214 | 143 | 7 | 1 | 47 | 156 |
| 2022 | 225 | 139 | 1 | 0 | 44 | 101 |
| 2023 | 197 | 159 | 5 | 3 | 47 | 253 |
| 2024 | 246 | 118 | 2 | 0 | 42 | 150 |
| 2025 | 155 | 111 | 8 | 0 | 47 | 143 |
How does Bronx County compare?
How Bronx County compares
Good-day share worse than US avg
Bronx County 56.6%
Albany County, New York 67.4%
US average 76.5%
Median AQI worse than US avg
Bronx County 47
Albany County, New York 39
US average 38
Unhealthy days / yr about average
Bronx County 0
Albany County, New York 0
US average 0
Other Counties in New York
Air quality comparison for nearby counties in New York.
Counties with Similar Air Quality
Counties across the US with a similar median AQI to Bronx County.
Beaver County, Pennsylvania
AQI 47 · 54.3% good
Bell County, Texas
AQI 47 · 61.3% good
Bowie County, Texas
AQI 47 · 57.3% good
Butte County, California
AQI 47 · 66.1% good
Calcasieu County, Louisiana
AQI 47 · 61.5% good
Carbon County, Utah
AQI 47 · 62.9% good
What Bronx County's air means for you
The air here stays in the breathable range year-round, with PM2.5 the main thing to watch.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-PM2.5 days, the guide explains what a median of 47 means for exposure. Health guidance
- See how Bronx County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Bronx County with its New York neighbours before drawing a conclusion about the region. All of New York
Based on 274 EPA-monitored days in 2025; figures reflect only days the monitors reported. Source: EPA Air Quality System annual summaries.
More Air Quality Data
Air Quality Guides
Frequently Asked Questions
What is the air quality in Bronx County, New York? ▼
Bronx County has a median Air Quality Index (AQI) of 47, rated "Good." 56.6% of monitored days (155 out of 274) had good air quality in 2025.
What is the main pollutant in Bronx County? ▼
The primary pollutant in Bronx County is Fine Particles (PM2.5), which was the main AQI driver on 160 days (58% of monitored days). Penetrates deep into lungs and bloodstream. Linked to heart disease and premature death.
How many unhealthy air days does Bronx County have? ▼
In 2025, Bronx County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 143.
Is the air quality in Bronx County getting better or worse? ▼
Air quality in Bronx County is worsening based on 5-year trends (2020-2025). Best year: 2024 with 246 good days. Worst year: 2025 with 155 good days.
What does AQI 47 mean for health? ▼
Bronx County's median AQI of 47 falls in the "Good" category. See the <a href="/guides/understanding-aqi" class="underline">AQI category guide</a> for what each range means for health.
How does Bronx County compare to other counties in New York? ▼
Bronx County has 56.6% good air days. Nearby counties in New York: Albany (67.4% good), Chautauqua (88.6% good), Dutchess (92.7% good), Erie (61.3% good), Essex (79.8% good), Hamilton (96.6% good).
What is the 90th percentile AQI in Bronx County? ▼
The 90th percentile AQI for Bronx County is 67, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 143 (USG).
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by County dataset, 2020–2025 (aqs.epa.gov). For current conditions (not shown here — this page is historical annual data), see EPA AirNow (airnow.gov). See our methodology for how AQI, median, and coverage figures are computed.
Informational only, not professional advice. Data from EPA AQS. See our disclaimer.
Every figure on PlainAir is rendered directly from EPA AQS air-quality monitoring data, no number is typed in by an editor. This page draws directly on EPA AQS air-quality monitoring data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.