Be the first to measure and contribute air quality data to your community
Air Quality 
Air Monitors
Air Purifiers
For Business
News
Support
Air quality in San Ysidro
Air quality index (AQI) and PM2.5 air pollution in San Ysidro
37 people follow this city
San Ysidro Air Quality Map
Real-time San Ysidro air pollution map
AIR QUALITY DATA SOURCE
* AQI modeled using satellite data Learn more
Pollen
What is the pollen count in San Ysidro today?
 | Index | Moderate | |
 | Tree pollen | Moderate | |
 | Grass pollen | Low | |
 | Weed pollen | None |
Source: tomorrow.io
Weather
What is the current weather in San Ysidro?
| Weather | Clear sky |
| Temperature | 77°F |
| Humidity | 7% |
| Wind | 11.5 mp/h |
| Pressure | 29.9 Hg |
live aqi city ranking
Real-time USA city ranking
| # | city | US AQI |
|---|---|---|
| 1 |  Rapid City, South Dakota | 82 |
| 2 | Mecca, California | 77 |
| 3 | Corpus Christi, Texas | 64 |
| 4 | Fontana, California | 64 |
| 5 | Port Arthur, Texas | 63 |
| 6 | San Gabriel, California | 63 |
| 7 | San Fernando, California | 62 |
| 8 | Conway, South Carolina | 60 |
| 9 | Glendale, California | 60 |
| 10 | Monrovia, California | 60 |
(local time)
SEE WORLD AQI RANKING
3D animated air pollution map
US AQI
35*
live AQI index
Good
Overview
What is the current air quality in San Ysidro?
| Air pollution level | Air quality index | Main pollutant |
|---|---|---|
| Good | 35* US AQI | PM2.5 |
| Pollutants | Concentration | |
|---|---|---|
| PM2.5 | 6.5*µg/m³ | |
!
PM2.5
x1.3
PM2.5 concentration in San Ysidro is currently 1.3 times the WHO annual air quality guideline value
Health Recommendations
What is the current air quality in San Ysidro?
 | Enjoy outdoor activities |
 | Open your windows to bring clean, fresh air indoors GET A MONITOR |
Forecast
San Ysidro air quality index (AQI) forecast
| Day | Pollution level | Weather | Temperature | Wind |
|---|---|---|---|---|
| Today | Good 35 AQI US |  | 91.4° 60.8° |  15.7 mp/h |
| Thursday, May 30 | Good 22 AQI US |  | 95° 62.6° | 15.7 mp/h |
| Friday, May 31 | Good 40 AQI US | | 95° 62.6° | 15.7 mp/h |
| Saturday, Jun 1 | Good 42 AQI US | | 93.2° 62.6° | 20.1 mp/h |
| Sunday, Jun 2 | Moderate 69 AQI US  |  | 95° 62.6° | 13.4 mp/h |
| Monday, Jun 3 | Moderate 70 AQI US | | 98.6° 64.4° | 13.4 mp/h |
| Tuesday, Jun 4 | Good 31 AQI US | | 102.2° 68° | 6.7 mp/h |
Interested in hourly forecast? Get the app
News
The latest air quality news and resources.
How to best protect from air pollution?
Where is the cleanest air quality in San Ysidro?
No locations are available.
AQI US, Metric