Lexington Weather

Lexington, Massachusetts, USA

64°F
7/25/2026 10:35pm 
  • Lexington Conditions: Clear
  • Temperature: 64.4°F / 18.0°CColder 2.2°F than last hour.
  • Dew Point: 51.6°FIncreased 0.7°Fsince last hour.
  • Relative Humidity: 63%Increased 6.0% since last hour.
  • Wind: Calm, 10-min avg: Calm, gust: None
  • Barometer: 29.97 inFalling 0.02 inHg/hr Falling Slowly
  • Visibility: 10 miles
  • Rain Today: 0.00 in
  •   

Air Quality Alert

Issued by the National Weather Service - Los Angeles, CA

    AIR QUALITY ALERT  

Santa Clarita Valley, CA; Western San Fernando Valley, CA; Eastern San Fernando Valley, CA; Santa Susana Mountains, CA; Interstate 5 Corridor, CA; Western San Gabriel Mountains and Highway 14 Corridor, CA; Eastern San Gabriel Mountains, CA; Los Angeles County San Gabriel Valley, CA

Air Quality Alert issued July 22 at 5:20PM PDT by NWS Los Angeles/Oxnard CA

AIR QUALITY ALERT FOR HARMFUL LEVELS OF OZONE (SMOG) AIR POLLUTION

Areas Affected: Eastern San Fernando Valley; Eastern San Gabriel Mountains; Interstate 5 Corridor; Los Angeles County San Gabriel Valley; Santa Clarita Valley; Santa Susana Mountains; Western San Fernando Valley; Western San Gabriel Mountains and Highway 14 Corridor

Urgency: Unknown

Severity: Unknown

Certainty: Unknown

Alert Sent: Wednesday 5:20pm PDT

Alert Effective: Wednesday 5:20pm PDT

Alert Expires: Monday 8:00pm PDT

Event Onset: Wednesday 5:20pm PDT

Issued by: NWS Los Angeles/Oxnard CA

Details: 
...AIR QUALITY ALERT FOR HARMFUL LEVELS OF OZONE (SMOG) AIR POLLUTION...

* WHAT...The South Coast AQMD 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...in the South Coast Air Basin and Coachella Valley. Levels
of ozone pollution can vary by time and location depending on
emissions and air pollution transport.

* WHEN...until 8 PM Monday. 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.

Information: 
To protect your health, check air quality levels and act as needed:

* When Air Quality Index (AQI) levels are "Unhealthy for
Sensitive Groups" (orange), sensitive groups as specified
above should limit extended or intense outdoor activity.
* When AQI is "Unhealthy" (red), everyone may experience health
impacts. Sensitive groups should avoid extended time outdoors.
* When AQI is "Very Unhealthy" (purple), sensitive groups should
avoid all outdoor physical activity. Everyone else should
avoid extended or intense outdoor activity.
* When AQI is "Hazardous" (maroon), everyone should avoid all
outdoor physical activity.

* ADDITIONAL DETAILS...

To help keep indoor air clean when air quality is poor:

* Keep windows and doors closed
* Run your air conditioner and/or an air purifier
* Do not use whole house fans or swamp coolers that bring in
outside air if you have other methods to stay cool
* Avoid other sources of pollution such as fireplaces, candles,
incense, and grilling

To help minimize outdoor ozone air pollution levels:

* Limit the use of gasoline powered lawn and garden equipment
until evening hours
* Try to delay trips to the gas station and the use of household
chemicals until the evening

Meta data: 
ID: urn:oid:2.49.0.1.840.0.6316c33b030ae4c9357ac51c26fe237f5225f57b.001.1
Codes: CAZ373, CAZ380, CAZ378, CAZ548, CAZ088, CAZ375, CAZ372, CAZ379
Link: https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.6316c33b030ae4c9357ac51c26fe237f5225f57b.001.1