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San Francisco Air Quality Index (AQI) | Air Pollution

Real-time PM2.5, PM10 air pollution level in San Francisco

Last Updated: 2026-07-18 18:21:01 (Local Time)

location image
Live AQI
44AQI (US)
Air Quality is
Good
PM2.5 :  10 µg/m³
pm10 :  20 µg/m³
Good
050
Moderate
100
Poor
150
Unhealthy
200
Severe
300
Hazardous
301+
aqi good level.webp in San Francisco
cloudy

18 °C

Cloudy
Humidity
Humidity70 %
Wind Speed
Wind Speed21.2 km/h
UV Index
UV Index1.5
Last Updated: 2026-07-18 18:21:01 (Local Time)

Presently, San Francisco ranks for having the good air quality among cities worldwide.

Map

San Francisco

Major Air Pollutants

San Francisco

PM₂.₅'s Icon

Particulate Matter(PM₂.₅)

10µg/m³

PM₁₀'s Icon

Particulate Matter(PM₁₀)

20µg/m³

CO's Icon

Carbon Monoxide(CO)

206ppb

SO₂'s Icon

Sulfur Dioxide(SO₂)

2ppb

NO₂'s Icon

Nitrogen Dioxide(NO₂)

6ppb

O₃'s Icon

Ozone(O₃)

24ppb

AQI Graph

Historical Air Quality Data

San Francisco

24 Hours
AQI (US)
San Francisco
AQI (US)
.
17-07-2026Time18-07-2026
21
Min. AQI (US)12:01am
82
Max. AQI (US)12:31pm

Want air quality data?

AQI (US) Trends - Annual Air Quality Changes

San Francisco, California, United States

AQI (US)

San Francisco's Locations

Real-time Air Pollution Level

locations
Status
AQI (US)
PM₂.₅(µg/m³)
PM₁₀(µg/m³)
Temp.(°C)
Humi.(%)
Good
46
11
20
18
70

United States's Metro Cities

Air Quality Index

Chicago City AQI

Chicago

107

temp.26°C
hum.74%
Los Angeles City AQI

Los Angeles

53

temp.25°C
hum.64%
Minneapolis City AQI

Minneapolis

51

temp.30°C
hum.39%
Nashville City AQI

Nashville

45

temp.28°C
hum.74%
New Orleans City AQI

New Orleans

51

temp.33°C
hum.58%
New York City City AQI

New York City

56

temp.23°C
hum.100%
San Francisco City AQI

San Francisco

46

temp.18°C
hum.70%
Washington City AQI

Washington

52

temp.27°C
hum.74%

Air Quality Calendar 2026

San Francisco

2026
AQI (US)
Good
050
Moderate
100
Poor
150
Unhealthy
200
Severe
300
Hazardous
301+

Health Advice For People Living In

San Francisco

0Cigarettes per day

Weekly 0 Cigarettes
Monthly 0 Cigarettes

Breathe easy and get active! The air quality is perfect for enjoying outdoor activities.

Source:

Berkeley Earth

Disclaimer: This cigarette-equivalent estimate is based on the average PM2.5 concentration over the last 24 hours, assuming continuous exposure during that time.

Solutions for Current AQI (US)

Air Purifier
Air PurifierTurn Off
Car Filter
Car FilterAdvisable
N95 Mask
N95 MaskAdvisable
Stay Indoor
Stay IndoorAdvisable

Prevent Health Problems: Understand Your Risks

San Francisco

asthma due to air pollution in San FranciscoAsthma
heart due to air pollution in San FranciscoHeart Issues
allergy due to air pollution in San FranciscoAllergies
sinus due to air pollution in San FranciscoSinus
flu due to air pollution in San FranciscoCold/Flu
copd due to air pollution in San FranciscoChronic (COPD)
Disclaimer: The above health risks are precautionary suggestions based on current AQI levels. You may not feel the effects immediately, but prolonged exposure to air pollution can contribute to these health conditions over time. AQI.IN is neither a medical expert nor a provider of medical advice. Please consult a doctor if you experience any of the above similar symptoms.

Most Polluted Cities 2026

United States

Analyze the real-time most air polluted cities in the country.

Most Polluted Cities Live Ranking 2026
World's Most PollutedCity Rankings (2025)
World's Most PollutedCountry Rankings(2025)
RankCityAQI Status

Standard Value

Follow

1.

Grand Rapids, Michigan

164

Unhealthy

6xabove Standard

2.

Lansing, Michigan

158

Unhealthy

5xabove Standard

3.

Milton, Massachusetts

158

Unhealthy

5xabove Standard

4.

Chelsea, Massachusetts

158

Unhealthy

5xabove Standard

5.

Holland, Michigan

158

Unhealthy

5xabove Standard

6.

Haverhill, Massachusetts

157

Unhealthy

5xabove Standard

7.

Brockton, Massachusetts

157

Unhealthy

5xabove Standard

8.

Chelmsford, Massachusetts

157

Unhealthy

5xabove Standard

9.

Boston, Massachusetts

157

Unhealthy

5xabove Standard

10.

Londonderry, New Hampshire

156

Unhealthy

4xabove Standard

Last Updated: 19 Jul 2026, 01:29 AM

AQI City Rankings

Air Quality Solutions For San Francisco

Explore the solutions of air quality monitoring & clean air.

Here are some applications that you can go through to find out the solutions.

Air Quality Monitor

Air Quality Monitor

Monitor the air quality
Air Quality Sensors

Air Quality Sensors

Sensors to measure the air quality
Fresh Air Machine

Fresh Air Machine

Clean the air you breathe
Car Cabin Filter

Car Cabin Filter

Purify the air in your car
N95 Mask

N95 Mask

Shield yourself from pollution
Prana Air offers the solutions of air quality monitoring and clean air machine for San Francisco

Air Quality Solution For Offices

A complete solution for air quality monitoring, data analysis, and fresh air solutions in workplaces prioritizing employee's health and productivity.

Prana Air offers the solutions of air quality monitoring and clean air machine for San Francisco

Air Quality Solutions For Smart City

Prana Air smart city project provides air quality monitors, drones, outdoor air purifiers, and data dashboards solution to improve air quality.

Prana Air offers the solutions of air quality monitoring and clean air machine for San Francisco

Air Quality Solutions for Schools | Institutes

Prana Air provides the air quality solutions for schools by air monitoring & fresh air machine that help the students to breather clean air.

Prana Air offers the solutions of air quality monitoring and clean air machine for San Francisco

Air Quality Solutions For Hotels

Prana Air air quality solutions are suited for hotel businesses. The occupancy of hotels is the main reasons for bad air quality.

Prana Air offers the solutions of air quality monitoring and clean air machine for San Francisco

Air Quality Solutions for Restaurants

Prana Air has the air quality solutions for restaurant, cafes, and gives you the power to know what your customers and staff breathe.

Prana Air offers the solutions of air quality monitoring and clean air machine for San Francisco

Air Quality Solutions for RMC Plants

Prana Air provides air quality monitoring solutions for RMC plants. Improve compliance, protect workers and community, and reduce emissions.

Prana Air offers the solutions of air quality monitoring and clean air machine for San Francisco

Air Quality Solutions for Fitness Center

Prana Air provides the air quality solutions of pollution monitoring and fresh air for fitness center - gym.

Prana Air offers the solutions of air quality monitoring and clean air machine for San Francisco

Air Quality Solutions for Parking Lot

A complete solution for air monitoring, data analysis, and fresh air solutions for enclosed car parking areas and car lots.

Prana Air offers the solutions of air quality monitoring and clean air machine for San Francisco

Air Quality Solutions for Retail Stores

Prana Air provides air quality solutions of pollution monitoring and fresh air for retail stores and shopping outlets.

Prana Air offers the solutions of air quality monitoring and clean air machine for San Francisco

Prana Air provides air quality solutions of pollution monitoring and fresh air for retail stores and shopping outlets

Prana Air provides the air quality solutions for airport. Gathering of many passengers is the main reasons of bad air quality in airport.

Prana Air offers the solutions of air quality monitoring and clean air machine for San Francisco

Air Quality Solutions For Construction Sites

Prana Air offers air quality monitoring solutions for construction sites with data cloud storage, web-dashboard, mobile apps, TV display.

Prana Air offers the solutions of air quality monitoring and clean air machine for San Francisco

Air Quality Solutions For Hospitals

Prana Air provides air quality monitoring and fresh air solutions for hospitals to ensure clean and healthy indoor air.

Prana Air offers the solutions of air quality monitoring and clean air machine for San Francisco

Air Quality Solutions For Washroom | Bathroom

Improve washroom and bathroom air quality with Prana Air air quality monitoring devices and fresh air machine. Breathe easy and stay healthy.

Prana Air offers the solutions of air quality monitoring and clean air machine for San Francisco

Air Quality Solutions for Banks

Prana Air provides air quality solutions of pollution monitoring and fresh air for banks and financial institutions.

Prana Air offers the solutions of air quality monitoring and clean air machine for San Francisco

Air Quality Solutions for Cinema

Air quality solutions for cinema halls or theatres will help the customers to get the good experience, comfort and breathe clean air.

Prana Air offers the solutions of air quality monitoring and clean air machine for San Francisco

Air Quality Solutions For Real Estates

Prana Air provides the air quality solutions of pollution monitoring and fresh air for real estates - residential and commercial.

San Francisco's AQI Data Analytics Solutions

Air quality data monitoring platforms

Mobile AppMobile App
Smart TV AppSmart TV App
Web DashboardWeb Dashboard
APIAPI
WidgetsWidgets

Air Quality FAQs

at San Francisco

Frequently Asked Questions About Air Quality

1. What is the current AQI (US) level in San Francisco?

The current real-time AQI (US) level in San Francisco is 44 (Good). This was last updated 2026-07-18 18:21:01 (Local Time).

2. When was the best AQI (US) level in San Francisco in the last 24 hours?

The best AQI (US) level was 21 (Good) at 12:01 AM, Jul 18, 2026 (Local Time) during the last 24 hours.

3. When was the worst AQI (US) level in San Francisco in the last 24 hours?

The worst AQI (US) level was 82 (Moderate) at 12:31 PM, Jul 18, 2026 (Local Time) during the last 24 hours.

4. What is the current trend of AQI (US) levels in San Francisco during last 24 hours?

The AQI (US) levels in San Francisco have been fluctuating throughout the last 24 hours. The levels have increased by highest 82 at 12:31 PM, Jul 18, 2026 (Local Time), lowest 21 at 12:01 AM, Jul 18, 2026 (Local Time).

5. What actions are recommended as per the current AQI (US) level in San Francisco?

The air quality is satisfactory, and air pollution poses little or no risk. No special precautions are needed; enjoy outdoor activities freely.

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Read the latest news

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Indoor Air Quality Monitor

Track indoor air quality with advanced connectivity and portability for real-time air quality data.

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