Air Quality Ranking — San Marcos
Updated June 22, 2026
See how neighborhoods in San Marcos compare on air quality. Rankings are based on measured data aggregated across each neighborhood boundary. How air quality is measured →
Top Air Quality Neighborhoods — Ranked
Air quality is generally good with rare instances of elevated readings. According to iHuus data, the atmosphere in Blanco Vista is cleaner than the San Marcos average.
Air quality in this area fluctuates between acceptable and unhealthy levels, which may cause occasional concern for sensitive groups. According to iHuus data, conditions here are largely consistent with the average seen across San Marcos.
Air quality in this area is generally acceptable, though sensitive individuals may experience occasional concern on certain days. According to iHuus data, the local air quality is largely consistent with the average found throughout San Marcos.
Full San Marcos Air Quality Ranking
| Neighborhood | Score | City Rank | vs. City Avg |
|---|---|---|---|
| Blanco Vista | 7.1 | #1 | +1.0 ↑ |
| Millview East | 6.2 | #2 | +0.1 ↑ |
| Fiarlawn | 6.2 | #3 | +0.1 ↑ |
| Two Rivers East | 6.1 | #4 | — |
| El Camino Real | 6 | #5 | -0.1 ↓ |
| Hills of Hays | 6 | #6 | -0.1 ↓ |
| Forest Hills | 6 | #7 | -0.1 ↓ |
| Hunter's Hill | 6 | #8 | -0.1 ↓ |
| Holland Hills | 6 | #9 | -0.1 ↓ |
| Sierra Circle | 6 | #10 | -0.1 ↓ |
| Tanglewood | 6 | #11 | -0.1 ↓ |
| Oak Heights | 6 | #12 | -0.1 ↓ |
| Spring Lake Hills | 6 | #13 | -0.1 ↓ |
| Millview West | 6 | #14 | -0.1 ↓ |
| Sessom Creek | 6 | #15 | -0.1 ↓ |
| Victory Gardens | 6 | #16 | -0.1 ↓ |
| Cottonwood Creek | 6 | #17 | -0.1 ↓ |
| Dunbar | 6 | #18 | -0.1 ↓ |
| Blanco River North | 6 | #19 | -0.1 ↓ |
| Downtown | 6 | #20 | -0.1 ↓ |
| East Guadalupe | 6 | #21 | -0.1 ↓ |
| Heritage | 6 | #22 | -0.1 ↓ |
| Rio Vista | 6 | #23 | -0.1 ↓ |
| Mockingbird Hills | 6 | #24 | -0.1 ↓ |
| Southwest Hills | 6 | #25 | -0.1 ↓ |
| Sunset Acres | 6 | #26 | -0.1 ↓ |
| Wallace Addition | 6 | #27 | -0.1 ↓ |
| Hughson Heights | 6 | #28 | -0.1 ↓ |
| Castle Forest | 6 | #29 | -0.1 ↓ |
| Blanco Gardens | 6 | #30 | -0.1 ↓ |
| Westover | 6 | #31 | -0.1 ↓ |
| Willow Creek | 6 | #32 | -0.1 ↓ |
iHuus Neighborhood Intelligence Insights
Get block-level neighborhood insights for San Marcos
- Street-level scores — see how individual blocks compare, not just neighborhood averages
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- 15 dimensions in full — walkability, noise, air quality, school quality, insurance coverage, population age profile, urban/rural index, and more
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