Rancho Viejo, Texas Air Quality
Rancho Viejo has a median AQI of 55, earning an air quality grade of B — good air quality that ranks better than 4% of US cities. Air quality has been trending worse over the past decade, a concern for local residents and health officials. Particulate matter (PM2.5) is the primary concern, often linked to vehicle traffic, industrial activity, and wildfire smoke. In 2025, Rancho Viejo recorded 77 good air quality days (32% of monitored days) and 5 unhealthy days.
Population: 2,849 • County: Cameron
Current AQI
Quick Facts
| Current AQI | 43 — Good |
| Air Quality Grade | B |
| Median AQI (2025) | 55 |
| vs. U.S. Cities | Better than 4% |
| Primary Pollutant | PM2.5 |
| Unhealthy Days/Year | 5 |
| 10-Year Trend | ↓ Worsening |
| 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 Rancho Viejo is sourced from the Mission C43 monitoring area, located approximately 47 miles from city center. This EPA-certified station continuously tracks particulate matter (PM2.5), the primary driver of air quality alerts in this area.
Rancho Viejo 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
Rancho Viejo Median AQI by Year
Annual EPA air quality data for Rancho Viejo — median AQI, day-category breakdown, and primary pollutant per year.
| Year | Median AQI | Good Days | Unhealthy Days | Max AQI | Primary Pollutant |
|---|---|---|---|---|---|
| 2025 | 55 | 77 | 5 | 139 | PM2.5 |
| 2024 | 61 | 99 | 61 | 171 | PM2.5 |
| 2023 | 54 | 161 | 6 | 141 | PM2.5 |
| 2022 | 48 | 191 | 3 | 120 | PM2.5 |
| 2021 | 52 | 162 | — | 99 | PM2.5 |
| 2020 | 52 | 158 | 9 | 184 | PM2.5 |
| 2019 | 52 | 172 | — | 91 | PM2.5 |
| 2018 | 51 | 178 | — | 99 | PM2.5 |
| 2017 | 42 | 259 | — | 87 | PM2.5 |
| 2016 | 45 | 220 | 2 | 110 | 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 Rancho Viejo Air Quality
What is the air quality in Rancho Viejo today?
The current AQI in Rancho Viejo is 43, 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 Rancho Viejo getting better or worse?
Air quality in Rancho Viejo has been worsening. The median AQI has risen 10 points (from 45 in 2016 to 55 in 2025), a concern for local health officials.
What is the most common air pollutant in Rancho Viejo?
PM2.5 is the primary air pollutant in Rancho Viejo, responsible for 208 days (86% of monitored days) in 2025. Particulate matter originates from vehicle exhaust, wildfires, construction, and industrial activity.
How many unhealthy air days does Rancho Viejo have per year?
In 2025, Rancho Viejo recorded 32% good air quality days (77 days) out of 243 monitored days. There were 5 Unhealthy for Sensitive Groups days and 0 Unhealthy days (AQI above 100). The highest single-day AQI recorded was 139.
What air quality grade does Rancho Viejo receive?
Rancho Viejo receives an air quality grade of B, placing it better than 4% of US cities. This is based on a median AQI of 55 in 2025, with 77 good air quality days. The EPA monitors air quality in this area continuously using certified monitoring stations.
Air Quality Grade
Better than 4% of US cities
Nearby Cities
Protect Your Health
With a median AQI of 55, indoor air purification is recommended
See Recommended Purifiers ↓Get AQI Alerts
Receive notifications when air quality changes in Rancho Viejo
National Rankings
See how Rancho Viejo compares to every other US city by air quality.
Best Air Quality Cities →All city rankingsRecommended Air Purifiers for Rancho Viejo
Rancho Viejo 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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