Colfax-City Hall, Placer, California Air Pollution: Real-time Air Quality Index (AQI)

Colfax-city Hall, Placer, California
Grass Valley-litton Building, Nevada, California
Auburn - Atwood Rd, Placer, California
Auburn-11645 Atwood Road, Placer, California
Lincoln - 1445 1st St., Placer, California
Lincoln-1445 1st Street, Placer, California
LOCATE THE
NEAREST CITY
SEARCH FOR
YOUR CITY

Colfax-City Hall, Placer, California AQI: Colfax-City Hall, Placer, California Real-time Air Quality Index (AQI).
34
Good
Updated on Wed. 18:00
temperature: 11°C
currentpast 2 daysminmax
PM2.5 AQI
34Colfax-City Hall, Placer, California, California PM25 (fine particulate matter) measured by : • CARB - California Air Resources Board • Air Now - US EPA. Values are converted to the US EPA AQI standard.582
O3 AQI
12Colfax-City Hall, Placer, California, California O3 (ozone) measured by : • CARB - California Air Resources Board • Air Now - US EPA. Values are converted to the US EPA AQI standard.230
Weather Information
Temp.
11Colfax-City Hall, Placer, California, California t (temp.) measured by Citizen Weather Observer Program (CWOP/APRS).415
Pressure
1018Colfax-City Hall, Placer, California, California p (pressure:) measured by Citizen Weather Observer Program (CWOP/APRS).10141020
Humidity
49Colfax-City Hall, Placer, California, California h (humidity) measured by Citizen Weather Observer Program (CWOP/APRS).3588
Wind
-Colfax-City Hall, Placer, California, California w (wind) measured by Citizen Weather Observer Program (CWOP/APRS).11

Air Quality Data provided by: CARB - California Air Resources Board (arb.ca.gov) and Air Now - US EPA (airnow.gov)

Do you know of any Air Quality stations in your area? why not participate to the map with your own air quality station?
Learn more at
> aqicn.org/gaia/ <
Share: “How polluted is the air today? Check out the real-time air pollution map, for more than 100 countries.”
https://aqicn.org/here/
Share: “Colfax-City Hall, Placer, California, California Air Quality is Good - on Wednesday, Dec 3rd 2025, 18:00 pm”
Cloud API
This air quality monitoring station real-time data can be programmatically accessed using this API url: (For more information, check the API page:aqicn.org/api/ or aqicn.org/data-platform/api/H233)

Looking for another city?

Enter a city name
↓ ↓ ↓
or let us find your nearest air quality monitoring station
Previously visited stations:


Do you know of any Air Quality stations in your area?
why not participate to the map with your own air quality station?

Our GAIA air quality monitors are very easy to set up: You only need a WIFI access point and a USB compatible power supply.

Once connected, your real time air pollution levels are instantaneously available on the maps and through the API.

The station comes with a 10-meter water-proof power cable, a USB power supply,mounting equipment and an optional solar panel.

Click for more information

Air quality historical data


Air Quality Rankings

Download the real-time Air Quality Index Widget for:


iPhone & iPad
Android
Windows Phone
Windows PC
Google Chrome
Firefox
Wordpress
Cloud API


Looking for more air quality related products?

Home Air Purifiers
Protection Masks & Respirators
Home Air Purifiers
Personal Air Quality Monitors
DIY Air Sensors
Professional Air Quality Monitoring Stations


About the Air Quality and Pollution Measurement:

About the Air Quality Levels

AQIAir Pollution LevelHealth ImplicationsCautionary Statement (for PM2.5)
0 - 50GoodAir quality is considered satisfactory, and air pollution poses little or no riskNone
51 -100ModerateAir quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.Active children and adults, and people with respiratory disease, such as asthma, should limit prolonged outdoor exertion.
101-150Unhealthy for Sensitive GroupsMembers of sensitive groups may experience health effects. The general public is not likely to be affected.Active children and adults, and people with respiratory disease, such as asthma, should limit prolonged outdoor exertion.
151-200UnhealthyEveryone may begin to experience health effects; members of sensitive groups may experience more serious health effectsActive children and adults, and people with respiratory disease, such as asthma, should avoid prolonged outdoor exertion; everyone else, especially children, should limit prolonged outdoor exertion
201-300Very UnhealthyHealth warnings of emergency conditions. The entire population is more likely to be affected.Active children and adults, and people with respiratory disease, such as asthma, should avoid all outdoor exertion; everyone else, especially children, should limit outdoor exertion.
300+HazardousHealth alert: everyone may experience more serious health effectsEveryone should avoid all outdoor exertion

To know more about Air Quality and Pollution, check the wikipedia Air Quality topic or the airnow guide to Air Quality and Your Health.

For very useful health advices of Beijing Doctor Richard Saint Cyr MD, check www.myhealthbeijing.com blog.


Usage Notice: All the Air Quality data are unvalidated at the time of publication, and due to quality assurance these data may be amended, without notice, at any time. The World Air Quality Index project has exercised all reasonable skill and care in compiling the contents of this information and under no circumstances will the World Air Quality Index project team or its agents be liable in contract, tort or otherwise for any loss, injury or damage arising directly or indirectly from the supply of this data.



Settings


Language Settings:


Temperature unit:
Celsius