Get a monitor and contributor to air quality data in your city.
Air Quality 
Air Monitors
Air Purifiers
For Business
News
Support
Air quality near 4139 Alpine Road, Portola Valley
Air quality index (AQI) and PM2.5 air pollution near 4139 Alpine Road, Portola Valley
94 people follow this station
Air Quality Map
Real-time 4139 Alpine Road air pollution map
AIR QUALITY DATA CONTRIBUTORS
Find out more about contributors and data sourcesPollen
What is the pollen count in 4139 Alpine Road today?
 | Index | Moderate | |
 | Tree pollen | Moderate | |
 | Grass pollen | Low | |
 | Weed pollen | None |
Source: tomorrow.io
Weather
What is the current weather near 4139 Alpine Road, Portola Valley?
| Weather | Clear sky |
| Temperature | 68°F |
| Humidity | 48% |
| Wind | 21.9 mp/h |
| Pressure | 29.9 Hg |
live aqi city ranking
Real-time USA city ranking
| # | city | US AQI |
|---|---|---|
| 1 | Durham, North Carolina | 126 |
| 2 | San Bernardino, California | 79 |
| 3 | Yucaipa, California | 75 |
| 4 | Redlands, California | 66 |
| 5 | Riverside, California | 64 |
| 6 | Vernal, Utah | 64 |
| 7 | Lake Arrowhead, California | 62 |
| 8 | Nampa, Idaho | 62 |
| 9 | Corpus Christi, Texas | 61 |
| 10 | Fontana, California | 61 |
(local time)
SEE WORLD AQI RANKING
3D animated air pollution map
live aqi station ranking
Real-time Portola Valley air quality ranking
| # | station | US AQI |
|---|---|---|
| 1 | Lower Sandstone | 58 |
| 2 | 4139 Alpine Road | 31 |
| 3 | Alpine Hills | 25 |
| 4 | 14 Arastradero | 22 |
| 5 | San Francisquito Creek Road | 21 |
| 6 | LSAC Building 950 | 20 |
| 7 | Millennium farm | 20 |
| 8 | 9 Valley Oak Street | 19 |
| 9 | Alhambra Court | 18 |
| 10 | Experimental Facilities Dept Shops EFD | 18 |
(local time)
SEE WORLD AQI RANKING
US AQI
31
live AQI index
Good
Overview
What is the current air quality near 4139 Alpine Road, Portola Valley?
| Air pollution level | Air quality index | Main pollutant |
|---|---|---|
| Good | 31 US AQI | PM2.5 |
| Pollutants | Concentration | |
|---|---|---|
| PM2.5 | 7.6µg/m³ | |
Health Recommendations
What is the current air quality near 4139 Alpine Road, Portola Valley?
 | Enjoy outdoor activities |
 | Open your windows to bring clean, fresh air indoors GET A MONITOR |
Forecast
4139 Alpine Road, Portola Valley air quality index (AQI) forecast
| Day | Pollution level | Weather | Temperature | Wind |
|---|---|---|---|---|
| Tuesday, Apr 30 | Good 19 AQI US | |||
| Wednesday, May 1 | Good 17 AQI US | |||
| Thursday, May 2 | Good 21 AQI US | |||
| Thursday, May 2 | Good 17 AQI US | | 68° 46.4° |  8.9 mp/h |
| Today | Good 31 AQI US |  100% | 51.8° 42.8° | 8.9 mp/h |
| Saturday, May 4 | Good 11 AQI US | | 55.4° 39.2° | 11.2 mp/h |
| Sunday, May 5 | Good 12 AQI US |  | 57.2° 41° | 6.7 mp/h |
| Monday, May 6 | Good 17 AQI US | | 60.8° 46.4° | 8.9 mp/h |
| Tuesday, May 7 | Good 14 AQI US | | 68° 46.4° | 11.2 mp/h |
| Wednesday, May 8 | Good 15 AQI US | | 73.4° 51.8° | 8.9 mp/h |
| Thursday, May 9 | Good 15 AQI US | | 77° 55.4° | 4.5 mp/h |
Interested in hourly forecast? Get the app
News
The latest air quality news and resources.
4139 Alpine Road air quality data attribution
Contributor
Anonymous Contributor
Data source
Data validated and calibrated by IQAirWhere is the cleanest air quality in Portola Valley?
- Thomas Fogarty Winery 3
- Coalmine View 5
- Pescadero 11
- Hayfields Road 12
- Alpine Road 13
- Georgia Lane 13
- Pomponio Court 13
- Ash Lane 15
- Bay Laurel 15
- 10 Alhambra Court 17
- 3249 Alpine Road 17
- Buck Meadow Drive 17
- Granada Court 17
- Loop Road 17
- Sandstone Street 17
- Sausal Drive 17
- Vista Verde Way 17
- Alhambra Court 18
- Experimental Facilities Dept Shops EFD 18
- Ladera - Lucero and Mimosa 18
- Los Trancos Road 18
- 9 Valley Oak Street 19
- LSAC Building 950 20
- Millennium farm 20
- San Francisquito Creek Road 21
- 14 Arastradero 22
- Alpine Hills 25
- 4139 Alpine Road 31
- Lower Sandstone 58
AQI US, Metric