Monterey Park Tract, California Air Quality
Monterey Park Tract has a median AQI of 45, earning an air quality grade of A- — excellent air quality that ranks better than 27% of US cities. Air quality has been improving steadily over the past decade, a positive sign for residents. Ground-level ozone is the primary concern, typically peaking on warm sunny days due to vehicle and industrial emissions. In 2025, Monterey Park Tract recorded 170 good air quality days (68% of monitored days) and 1 unhealthy days.
Population: 74 • County: Stanislaus
Current AQI
Quick Facts
| Current AQI | 29 — Good |
| Air Quality Grade | A- |
| Median AQI (2025) | 45 |
| vs. U.S. Cities | Better than 27% |
| Primary Pollutant | Ozone |
| Unhealthy Days/Year | 1 |
| 10-Year Trend | ↑ Improving |
| 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 Monterey Park Tract is sourced from the Modesto - 14th Street monitoring area, located approximately 8 miles from city center. This EPA-certified station continuously tracks ground-level ozone, the primary driver of air quality alerts in this area.
Wildfire smoke is a significant factor in Monterey Park Tract's air quality, with regional fires capable of pushing AQI from Good to Unhealthy within hours during fire season (typically July through October). On smoke-impacted days, staying indoors with windows closed and running an air purifier with a HEPA filter is the most effective protection.
AQI Trend (10 Years)
Air Quality Days by Year
Monterey Park Tract Median AQI by Year
Annual EPA air quality data for Monterey Park Tract — median AQI, day-category breakdown, and primary pollutant per year.
| Year | Median AQI | Good Days | Unhealthy Days | Max AQI | Primary Pollutant |
|---|---|---|---|---|---|
| 2025 | 45 | 170 | 1 | 101 | Ozone |
| 2024 | 53 | 166 | 38 | 150 | Ozone |
| 2023 | 54 | 166 | 23 | 150 | Ozone |
| 2022 | 57 | 108 | 23 | 166 | PM2.5 |
| 2021 | 61 | 84 | 47 | 172 | PM2.5 |
| 2020 | 60 | 131 | 37 | 195 | PM2.5 |
| 2019 | 52 | 168 | 23 | 177 | Ozone |
| 2018 | 59 | 109 | 47 | 265 | PM2.5 |
| 2017 | 61 | 127 | 63 | 185 | Ozone |
| 2016 | 59 | 102 | 43 | 164 | 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 Monterey Park Tract Air Quality
What is the air quality in Monterey Park Tract today?
The current AQI in Monterey Park Tract is 29, 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 Monterey Park Tract getting better or worse?
Air quality in Monterey Park Tract has been improving. The median AQI has dropped 14 points (from 59 in 2016 to 45 in 2025), a positive trend for residents.
What is the most common air pollutant in Monterey Park Tract?
Ozone is the primary air pollutant in Monterey Park Tract, responsible for 182 days (73% of monitored days) in 2025. Ground-level ozone forms when sunlight reacts with emissions from vehicles and industry, typically peaking on hot summer afternoons.
How many unhealthy air days does Monterey Park Tract have per year?
In 2025, Monterey Park Tract recorded 68% good air quality days (170 days) out of 249 monitored days. There were 1 Unhealthy for Sensitive Groups days and 0 Unhealthy days (AQI above 100). The highest single-day AQI recorded was 101.
What air quality grade does Monterey Park Tract receive?
Monterey Park Tract receives an air quality grade of A-, placing it better than 27% of US cities. This is based on a median AQI of 45 in 2025, with 170 good air quality days. The EPA monitors air quality in this area continuously using certified monitoring stations.
Air Quality Grade
Better than 27% of US cities
Nearby Cities
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National Rankings
See how Monterey Park Tract compares to every other US city by air quality.
Best Air Quality Cities →All city rankingsRecommended Air Purifiers for Monterey Park Tract
Ozone is Monterey Park Tract's primary pollutant. Standard HEPA filters don't capture ozone molecules — you need activated carbon or PECO technology to chemically break them down. We highlight those units here.
Blueair Blue Pure 211+
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Other Great Options
Molekule Air Pro
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Honeywell HPA300
Powerful workhorse for large rooms. Built to last.
RabbitAir MinusA2
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