San Francisco, California
Regional Weather Alerts
| Alert: | Air Quality Alert |
| Area(s): | San Bernardino and Riverside County Valleys-The Inland Empire |
| Effective: | 2026-05-20 @ 7:44 pm -> 2026-05-21 @ 7:45 pm |
| Onset: | 2026-05-20 @ 7:44 pm |
| Severity: | Unknown |
| Certainty: | Unknown |
| Urgency: | Unknown |
| Issued By: | NWS San Diego CA on 2026-05-20 @ 7:44 pm |
| Headline: | Air Quality Alert issued May 20 at 5:44PM PDT by NWS San Diego CA |
| Description: |
* WHAT...The South Coast AQMD has issued an air quality alert due to increased fine particle pollution from wildfire smoke. Visit https://www.aqmd.gov/alertinfo to check current and forecasted air quality levels. * WHERE...in portions of Riverside, San Bernardino, and Los Angeles Counties. Levels of particle pollution can vary by time and location depending on fire activity and local weather conditions. * WHEN...until Thursday at 10:00 PM. * IMPACTS...Particles in wildfire smoke can get deep into the lungs and cause serious health problems such as heart attacks, strokes, asthma attacks, and difficulty breathing. Everyone can be affected, but people with lung or heart disease, older adults, people who are pregnant, children, and those who spend a lot of time outdoors are at greater risk. |
| Alert: | Air Quality Alert |
| Area(s): | Eastern San Fernando Valley; Eastern San Gabriel Mountains; Los Angeles County San Gabriel Valley; Santa Clarita Valley; Santa Susana Mountains; Western San Fernando Valley; Western San Gabriel Mountains and Highway 14 Corridor |
| Effective: | 2026-05-20 @ 5:59 pm -> 2026-05-22 @ 12:00 am |
| Onset: | 2026-05-20 @ 5:59 pm |
| Severity: | Unknown |
| Certainty: | Unknown |
| Urgency: | Unknown |
| Issued By: | NWS Los Angeles/Oxnard CA on 2026-05-20 @ 5:59 pm |
| Headline: | Air Quality Alert issued May 20 at 3:59PM PDT by NWS Los Angeles/Oxnard CA |
| Description: |
* WHAT...The South Coast AQMD has issued an air quality alert due to increased fine particle pollution from wildfire smoke. Visit https://www.aqmd.gov/alertinfo to check current and forecasted air quality levels. * WHERE...in portions of Los Angeles, Riverside, and San Bernardino Counties. Levels of particle pollution can vary by time and location depending on fire activity and local weather conditions. * WHEN...until 10 PM on Thursday. * IMPACTS...Particles in wildfire smoke can get deep into the lungs and cause serious health problems such as heart attacks, strokes, asthma attacks, and difficulty breathing. Everyone can be affected, but people with lung or heart disease, older adults, people who are pregnant, children, and those who spend a lot of time outdoors are at greater risk. |
| Alert: | Air Quality Alert |
| Area(s): | Imperial Valley |
| Effective: | 2026-05-20 @ 12:06 pm -> 2026-05-21 @ 10:00 pm |
| Onset: | 2026-05-20 @ 12:06 pm |
| Severity: | Unknown |
| Certainty: | Unknown |
| Urgency: | Unknown |
| Issued By: | NWS Phoenix AZ on 2026-05-20 @ 12:06 pm |
| Headline: | Air Quality Alert issued May 20 at 10:06AM MST by NWS Phoenix AZ |
| Description: |
* WHAT...The Imperial County APCD has issued an air quality alert due to harmful levels of ozone pollution. Visit https://www.aqmd.gov/alertinfo to check current and forecasted air quality levels. * WHERE...the Imperial Valley. Levels of ozone pollution can vary by time and location depending on emissions and air pollution transport. * WHEN...from 11:00 a.m. through 8:00 p.m. Thursday, May 21, 2026. The highest ozone levels typically occur in the afternoon and early-evening hours. * IMPACTS... Ozone air pollution can cause serious health problems, including trouble breathing, asthma attacks, and lung damage. Everyone can be affected, but sensitive groups such as people with lung disease, older adults, people who are pregnant, children, and those who spend a lot of time outdoors are at greater risk. |
| Alert: | Air Quality Alert |
| Area(s): | Santa Ana Mountains and Foothills; Orange County Coastal; Orange County Inland |
| Effective: | 2026-05-19 @ 11:42 pm -> 2026-05-20 @ 11:45 pm |
| Onset: | 2026-05-19 @ 11:42 pm |
| Severity: | Unknown |
| Certainty: | Unknown |
| Urgency: | Unknown |
| Issued By: | NWS San Diego CA on 2026-05-19 @ 11:42 pm |
| Headline: | Air Quality Alert issued May 19 at 9:42PM PDT by NWS San Diego CA |
| Description: |
* WHAT...The South Coast AQMD has issued an air quality alert due to increased fine particle pollution from wildfire smoke. Visit https://www.aqmd.gov/alertinfo to check current and forecasted air quality levels. * WHERE...most of LA County and all of Orange County. Levels of particle pollution can vary by time and location depending on fire activity and local weather conditions. * WHEN...until Tuesday evening. * IMPACTS...Particles in wildfire smoke can get deep into the lungs and cause serious health problems such as heart attacks, strokes, asthma attacks, and difficulty breathing. Everyone can be affected, but people with lung or heart disease, older adults, people who are pregnant, children, and those who spend a lot of time outdoors are at greater risk. |
| Alert: | Air Quality Alert |
| Area(s): | San Bernardino and Riverside County Valleys-The Inland Empire |
| Effective: | 2026-05-19 @ 11:42 pm -> 2026-05-20 @ 11:45 pm |
| Onset: | 2026-05-19 @ 11:42 pm |
| Severity: | Unknown |
| Certainty: | Unknown |
| Urgency: | Unknown |
| Issued By: | NWS San Diego CA on 2026-05-19 @ 11:42 pm |
| Headline: | Air Quality Alert issued May 19 at 9:42PM PDT by NWS San Diego CA |
| Description: |
* WHAT...The South Coast AQMD has issued an air quality alert due to increased fine particle pollution from wildfire smoke. Visit https://www.aqmd.gov/alertinfo to check current and forecasted air quality levels. * WHERE...in portions of Riverside, San Bernardino, and Los Angeles Counties. Levels of particle pollution can vary by time and location depending on fire activity and local weather conditions. * WHEN...until Wednesday at 4:30 PM. * IMPACTS...Particles in wildfire smoke can get deep into the lungs and cause serious health problems such as heart attacks, strokes, asthma attacks, and difficulty breathing. Everyone can be affected, but people with lung or heart disease, older adults, people who are pregnant, children, and those who spend a lot of time outdoors are at greater risk. |
| Alert: | Air Quality Alert |
| Area(s): | Santa Ana Mountains and Foothills; Orange County Coastal; Orange County Inland |
| Effective: | 2026-05-19 @ 11:37 pm -> 2026-05-20 @ 11:45 pm |
| Onset: | 2026-05-19 @ 11:37 pm |
| Severity: | Unknown |
| Certainty: | Unknown |
| Urgency: | Unknown |
| Issued By: | NWS San Diego CA on 2026-05-19 @ 11:37 pm |
| Headline: | Air Quality Alert issued May 19 at 9:37PM PDT by NWS San Diego CA |
| Description: |
* WHAT...The South Coast AQMD has issued an air quality alert due to increased fine particle pollution from wildfire smoke. Visit https://www.aqmd.gov/alertinfo to check current and forecasted air quality levels. * WHERE...most of LA County and all of Orange County. Levels of particle pollution can vary by time and location depending on fire activity and local weather conditions. * WHEN...until Tuesday evening. * IMPACTS...Particles in wildfire smoke can get deep into the lungs and cause serious health problems such as heart attacks, strokes, asthma attacks, and difficulty breathing. Everyone can be affected, but people with lung or heart disease, older adults, people who are pregnant, children, and those who spend a lot of time outdoors are at greater risk. |
| Alert: | Air Quality Alert |
| Area(s): | San Bernardino and Riverside County Valleys-The Inland Empire |
| Effective: | 2026-05-19 @ 11:37 pm -> 2026-05-20 @ 11:45 pm |
| Onset: | 2026-05-19 @ 11:37 pm |
| Severity: | Unknown |
| Certainty: | Unknown |
| Urgency: | Unknown |
| Issued By: | NWS San Diego CA on 2026-05-19 @ 11:37 pm |
| Headline: | Air Quality Alert issued May 19 at 9:37PM PDT by NWS San Diego CA |
| Description: |
* WHAT...The South Coast AQMD has issued an air quality alert due to increased fine particle pollution from wildfire smoke. Visit https://www.aqmd.gov/alertinfo to check current and forecasted air quality levels. * WHERE...in portions of Riverside, San Bernardino, and Los Angeles Counties. Levels of particle pollution can vary by time and location depending on fire activity and local weather conditions. * WHEN...until Tuesday evening. * IMPACTS...Particles in wildfire smoke can get deep into the lungs and cause serious health problems such as heart attacks, strokes, asthma attacks, and difficulty breathing. Everyone can be affected, but people with lung or heart disease, older adults, people who are pregnant, children, and those who spend a lot of time outdoors are at greater risk. |