Air Quality (AQI) & Weather in Half Moon Bay, CA (94019)

Q: What is the primary air pollutant in Half Moon Bay, CA?

The primary air pollutants monitored in Half Moon Bay include Fine Particulate Matter (PM2.5), Coarse Particulate Matter (PM10), Ground-level Ozone (O3), Carbon Monoxide (CO), Nitrogen Dioxide (NO2), and Sulfur Dioxide (SO2).

Air Quality Index

Temperature

--°C

Real-time Temp

Humidity

--%

Relative humidity

Wind

-- km/h

Wind Speed

Pollutants

Good

Moderate

USG

Unhealthy

Very Unhealthy

Hazard

Location Map

37.44826, -122.40230

7-Day Forecast

Full Weather for Half Moon Bay

Past 30 Days — AQI History

Health Advice

Loading recommendations...

Recommendations are indicative. Consult local advisories if you have underlying health concerns.

About Air Quality in Half Moon Bay, CA

Get real-time updates on air quality in Half Moon Bay (94019), including detailed metrics for key pollutants like PM2.5, PM10, Ozone (O₃), Carbon Monoxide (CO), Nitrogen Dioxide (NO₂), and Sulfur Dioxide (SO₂).

This dashboard presents live Air Quality Index (AQI) calculations alongside a 7-day weather forecast for Half Moon Bay, CA. Monitor changing pollution levels, relative humidity, wind speeds, and temperature trends to plan safer outdoor activities for your family.

Understanding AQI Ratings

The standard US Air Quality Index (AQI) runs from 0 to 500. Higher values indicate higher levels of air pollution:

0–50 (Good): Air quality is satisfactory; minimal risk.
51–100 (Moderate): Acceptable; slight concern for sensitive people.
101–150 (USG): Sensitive groups may experience health effects.
151–200 (Unhealthy): General public may begin to feel effects.
201–300 (Very Unhealthy): Health alert; increased risk for everyone.

Air Pollution Prevention & Health Tips for Half Moon Bay

Air quality in Half Moon Bay, CA fluctuates based on weather patterns, traffic volume, seasonal industrial output, and atmospheric conditions.

Outdoor Mask Protection

During high PM2.5 pollution spikes (AQI > 150), standard surgical masks are insufficient. N95 or KN95 respirators are recommended for effective filtering.

Indoor Air Purifiers

Using True HEPA air purifiers inside homes and offices in Half Moon Bay helps filter airborne dust, allergens, pollen, and dangerous fine particles.

Environmental & Demographic Profile — Half Moon Bay, CA (94019)

The ZIP code 94019 is situated in Half Moon Bay, located within San Mateo County, CA. According to US Census estimates, the 94019 postal code serves an estimated population of 14,754 residents across an area with a population density of 95.4 people per square mile. Operating under the America/Los Angeles timezone, local atmospheric telemetry in this area is monitored continuously via nearby regional monitoring stations.

Half Moon Bay is categorized as a low-density or regional geographic area. Lower industrial activity generally reduces localized vehicular pollution, though ambient air quality can still be impacted by agricultural particulate matter, regional wind currents, or seasonal meteorological activity.

Geographic & Administrative Details

County: San Mateo County
Coordinates: 37.4483, -122.4023
Timezone: America/Los_Angeles
Associated Regions: San Mateo

Frequently Asked Questions About Half Moon Bay Air Quality

What is the primary air pollutant in Half Moon Bay, CA?

The primary pollutants continuously monitored in Half Moon Bay include Fine Particulate Matter (PM2.5), Coarse Particulate Matter (PM10), Ground-level Ozone (O₃), Carbon Monoxide (CO), Nitrogen Dioxide (NO₂), and Sulfur Dioxide (SO₂).

Is it safe to exercise outdoors today in Half Moon Bay (94019)?

Outdoor exercise safety in Half Moon Bay depends on the real-time Air Quality Index (AQI). An AQI between 0 and 50 is ideal for all outdoor activities. If the index rises above 100, sensitive individuals should reduce prolonged outdoor exertion.

How often is the air quality data updated for ZIP code 94019?

Air quality observations and weather metrics on this page are updated in real-time using continuous telemetry from local satellite feeds and ground station monitors.