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Ontario Air Quality Index (AQI) | Air Pollution

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

Last Updated: 2025-05-28 11:10:31 AM (Local Time)

location image
Live AQI
52
Air Quality is
Moderate
pm10 :  25 µg/m³
PM2.5 :  10 µg/m³
Good
050
Moderate
100
Poor
150
Unhealthy
200
Severe
300
Hazardous
301+
aqi moderate level in Ontario
mist

16 °C

Mist
Humidity
Humidity81 %
Wind Speed
Wind Speed4 km/h
UV Index
UV Index1
Last Updated: 2025-05-28 11:10:31 AM (Local Time)
Map

Ontario

Major Air Pollutants

Ontario

PM2.5's Icon

Particulate Matter(PM2.5)

10µg/m³

PM10's Icon

Particulate Matter(PM10)

25µg/m³

CO's Icon

Carbon Monoxide(CO)

33ppb

SO2's Icon

Sulfur Dioxide(SO2)

1ppb

NO2's Icon

Nitrogen Dioxide(NO2)

14ppb

O3's Icon

Ozone(O3)

24ppb

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How Air Pollution Fuels COPD—and What You Can Do About It?

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The Mask Returns: COVID Cases Spike in Singapore, Hong Kong, and India

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Long-Term Exposure to Polluted Air and Its Impact on Heart Health: A Global Perspective

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Methane Emissions from Delhi’s Landfills: An Invisible Threat

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Carbon monoxide (CO) or PM2.5: Which is more dangerous for human health and the environment?

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The Hidden Link Between Air Pollution and Parkinson’s Disease: What the Study Shows?

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Two Worlds, One Breath: World Asthma Day 2025 and the Link Between Air Pollution and Asthma

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Understand the Indoor Air Quality in Schools: Is Your Child Breathing Safe Air?

Understand the Indoor Air Quality in Schools: Is Your Child Breathing Safe Air?

Sleep Interrupted: How Air Pollution Steals Your Res

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Understanding the AQI: What the Air You Breathe Means for Your Health

Understanding the AQI: What the Air You Breathe Means for Your Health

AQI Graph

Historical Air Quality Data

Ontario

24 Hours
AQI
Ontario

Want air quality data?

Download 2024 Annual Data

World Air Quality Report

Globe

AQI Trends - Annual Air Quality Changes

Ontario, California, United States

AQI
Year
.
AQI

Annual AQI Trends

2020
63AQI
2021
59AQI
-6%
Fall
2022
57AQI
-3%
Fall
2023
48AQI
-16%
Fall
2024
50AQI
4%
Rise
2025
42AQI
-16%
Fall
Overall Annual Percentage (%) change of AQI in (2020 to 2025)
-7%
Fall (Improved AQI)

Most & Least Polluted Months

Most PollutedSeptember, 202083AQI
Least PollutedJuly, 202021AQI

* This data analysis is from year 2020 - 2025

Ontario's Locations

Real-time Air Pollution Level

Location
Status
AQI
PM2.5(µg/m³)
PM10(µg/m³)
Temp.(°C)
Humi.(%)
Ontario Mills Parkway
Moderate
51
9
27
19
57
Ontario Route 60 Near Road
Moderate
53
10
24
16
82
South Pinehurst Place
Moderate
53
10
24
16
82

United States's Metro Cities

Air Quality Index

East Chicago City AQI

East Chicago

38

temp.13°C
hum.97%
Los Angeles City AQI

Los Angeles

48

temp.17°C
hum.80%
Minneapolis City AQI

Minneapolis

24

temp.16°C
hum.67%
Nashville City AQI

Nashville

33

temp.24°C
hum.71%
New Orleans City AQI

New Orleans

44

temp.31°C
hum.70%
New York City City AQI

New York City

32

temp.16°C
hum.70%
San Francisco City AQI

San Francisco

24

temp.13°C
hum.86%
Port Washington City AQI

Port Washington

25

temp.15°C
hum.82%

Air Quality Calendar 2025

Ontario

2025
AQI
January
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1 Jan
103
2 Jan
78
3 Jan
67
4 Jan
93
5 Jan
59
6 Jan
47
7 Jan
50
8 Jan
58
9 Jan
47
10 Jan
54
11 Jan
74
12 Jan
31
13 Jan
31
14 Jan
31
15 Jan
33
16 Jan
37
17 Jan
47
18 Jan
58
19 Jan
73
20 Jan
58
21 Jan
32
22 Jan
44
23 Jan
30
24 Jan
40
25 Jan
58
26 Jan
33
27 Jan
33
28 Jan
50
29 Jan
50
30 Jan
60
31 Jan
68
February
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1 Feb
74
2 Feb
77
3 Feb
70
4 Feb
56
5 Feb
30
6 Feb
34
7 Feb
25
8 Feb
34
9 Feb
48
10 Feb
47
11 Feb
30
12 Feb
31
13 Feb
23
14 Feb
27
15 Feb
31
16 Feb
41
17 Feb
53
18 Feb
46
19 Feb
50
20 Feb
52
21 Feb
36
22 Feb
42
23 Feb
48
24 Feb
56
25 Feb
52
26 Feb
50
27 Feb
36
28 Feb
38
March
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1 Mar
41
2 Mar
34
3 Mar
27
4 Mar
35
5 Mar
50
6 Mar
27
7 Mar
32
8 Mar
38
9 Mar
39
10 Mar
39
11 Mar
29
12 Mar
29
13 Mar
22
14 Mar
23
15 Mar
38
16 Mar
46
17 Mar
44
18 Mar
24
19 Mar
27
20 Mar
30
21 Mar
42
22 Mar
44
23 Mar
53
24 Mar
55
25 Mar
64
26 Mar
34
27 Mar
32
28 Mar
29
29 Mar
31
30 Mar
32
31 Mar
24
April
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1 Apr
24
2 Apr
25
3 Apr
30
4 Apr
30
5 Apr
26
6 Apr
30
7 Apr
33
8 Apr
39
9 Apr
43
10 Apr
47
11 Apr
46
12 Apr
45
13 Apr
49
14 Apr
50
15 Apr
50
16 Apr
38
17 Apr
28
18 Apr
28
19 Apr
33
20 Apr
38
21 Apr
40
22 Apr
45
23 Apr
39
24 Apr
40
25 Apr
39
26 Apr
23
27 Apr
21
28 Apr
27
29 Apr
37
30 Apr
45
May
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1 May
45
2 May
42
3 May
42
4 May
24
5 May
30
6 May
29
7 May
35
8 May
42
9 May
43
10 May
40
11 May
38
12 May
41
13 May
25
14 May
28
15 May
41
16 May
45
17 May
36
18 May
30
19 May
40
20 May
43
21 May
45
22 May
51
23 May
51
24 May
49
25 May
49
26 May
48
27 May
-
28 May
-
29 May
-
30 May
-
31 May
-
Good
050
Moderate
100
Poor
150
Unhealthy
200
Severe
300
Hazardous
301+

Health Advice For People Living In

Ontario

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

Solutions for Current AQI

  • Air Purifier
    Air PurifierTurn On
  • Car Filter
    Car FilterMust
  • N95 Mask
    N95 MaskMust
  • Stay Indoor
    Stay IndoorMust

Must turn on the air purifier to enjoy fresh air.

Prevent Health Problems: Understand Your Risks

Ontario

  • asthma due to air pollution in OntarioAsthma
  • heart due to air pollution in OntarioHeart Issues
  • allergy due to air pollution in OntarioAllergies
  • sinus due to air pollution in OntarioSinus
  • flu due to air pollution in OntarioCold/Flu
  • copd due to air pollution in OntarioChronic (COPD)
asthma due to air pollution in Ontario

Mid. Chances of Asthma

Asthma

Risk of Asthma symptoms is Mid. when AQI is Moderate (50-150)

Moderate symptoms including frequent wheezing, noticeable shortness of breath, chest tightness, and persistent cough.

Do's :

  • Limit outdoor activities when AQI is poor.

  • Clean indoor air with an air purifier to reduce exposure.

  • Soothe the respiratory tract with herbal teas or warm water to help alleviate symptoms.

Don'ts :

  • Exercise outdoors without a mask.

  • Stay in smoky areas with strong fumes.

Most Polluted Cities 2025

United States

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

Most Polluted Cities Live Ranking 2025
World's Most PollutedCity Rankings (2024)
World's Most PollutedCountry Rankings(2024)
RankCityAQIAQI Status

Standard Value

Follow

1.

Maricopa, United States

110
Poor
7xabove Standard

2.

Progress Village, United States

106
Poor
7xabove Standard

3.

Stanfield, United States

106
Poor
7xabove Standard

4.

San Tan Valley, United States

102
Poor
7xabove Standard

5.

Casa Blanca, United States

99
Moderate
7xabove Standard

6.

Casa Grande, United States

99
Moderate
7xabove Standard

7.

Riverview, United States

97
Moderate
6xabove Standard

8.

Eloy, United States

94
Moderate
6xabove Standard

9.

Gibsonton, United States

93
Moderate
6xabove Standard

10.

Barstow, United States

92
Moderate
6xabove Standard

Last Updated: 28 May 2025, 05:12 PM

AQI City Rankings

Air Quality Solutions For Ontario

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
air quality solutions for offices for Ontario

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.

air quality solutions for smart-city for Ontario

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.

air quality solutions for institutes for Ontario

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.

air quality solutions for hotels for Ontario

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.

air quality solutions for restaurants for Ontario

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.

air quality solutions for rmc-plants for Ontario

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.

air quality solutions for fitness-center for Ontario

Air Quality Solutions for Fitness Center

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

air quality solutions for parking-lot for Ontario

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.

air quality solutions for retail-stores for Ontario

Air Quality Solutions for Retail Stores

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

air quality solutions for airport for Ontario

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.

air quality solutions for construction-sites for Ontario

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.

air quality solutions for hospitals for Ontario

Air Quality Solutions For Hospitals

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

air quality solutions for bathroom for Ontario

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.

air quality solutions for banks for Ontario

Air Quality Solutions for Banks

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

air quality solutions for cinema for Ontario

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.

air quality solutions for real-estates for Ontario

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.

Ontario's AQI Data Analytics Solutions

Air quality data monitoring platforms

Mobile AppMobile App
Smart TV AppSmart TV App
Web DashboardWeb Dashboard
APIAPI
WidgetsWidgets
aqi air quality app for Ontario
Mobile App

Empower Your Decisions with Reliable Data

Your area’s real-time data with detailed parameters.

Your area’s real-time data with detailed parameters.

Personalized health advice as per current AQI.

Personalized health advice as per current AQI.

Analytical data to identify trends and conditions.

Analytical data to identify trends and conditions.

Connect and control your air quality devices.

Connect and control your air quality devices.

Air Quality FAQs

at Ontario

Frequently Asked Questions About Air Quality

What is the current AQI level in Ontario?

The current real-time AQI level in Ontario is 52 (Moderate). This was last updated 2025-05-28 11:10:31 AM (Local Time).

When was the best AQI level in Ontario in the last 24 hours?

The best AQI level was 41 (Good) at 8:10 AM (Local Time) during the last 24 hours.

When was the worst AQI level in Ontario in the last 24 hours?

The worst AQI level was 50 (Good) at 5:10 PM, May 27, 2025 (Local Time) during the last 24 hours.

What is the current trend of AQI levels in Ontario during last 24 hours?

The AQI levels in Ontario have been fluctuating throughout the last 24 hours. The levels have increased by highest 50 at 5:10 PM, May 27, 2025 (Local Time), lowest 41 at 8:10 AM (Local Time).

What actions are recommended as per the current AQI level in Ontario?

Current AQI levels are acceptable; however, some pollutants may be a concern for a small number of sensitive individuals.

Recent AQI Blogs

Read the latest news

Here are some latest blogs that you can go through to find out more air pollution.

Delhi Rain May 2025 Breaks Records — Why It Happened and What’s Next

Delhi Rain May 2025 Breaks Records — Why It Happened and What’s Next

26 May 2025Shakshi
How Air Pollution Fuels COPD—and What You Can Do About It?

How Air Pollution Fuels COPD—and What You Can Do About It?

22 May 2025Shakshi
How Heat and Air Pollution Can Be Increasing Mortality in India: New Study Reveals

How Heat and Air Pollution Can Be Increasing Mortality in India: New Study Reveals

19 May 2025Shakshi
Thick Dust Covers New Delhi: What’s Happening on May 15, 2025?

Thick Dust Covers New Delhi: What’s Happening on May 15, 2025?

15 May 2025Shakshi
Long-Term Exposure to Polluted Air and Its Impact on Heart Health: A Global Perspective

Long-Term Exposure to Polluted Air and Its Impact on Heart Health: A Global Perspective

15 May 2025Gyane
Carbon monoxide (CO) or PM2.5: Which is more dangerous for human health and the environment?

Carbon monoxide (CO) or PM2.5: Which is more dangerous for human health and the environment?

14 May 2025Shakshi
Methane Emissions from Delhi’s Landfills: An Invisible Threat

Methane Emissions from Delhi’s Landfills: An Invisible Threat

12 May 2025Shakshi
The Hidden Link Between Air Pollution and Parkinson’s Disease: What the Study Shows?

The Hidden Link Between Air Pollution and Parkinson’s Disease: What the Study Shows?

7 May 2025Shakshi
World Asthma Day 2025: The Link Between Air Pollution and Asthma

World Asthma Day 2025: The Link Between Air Pollution and Asthma

6 May 2025Shakshi
Why Air Quality Monitoring is Essential for Sustainable Development: Key Insights

Why Air Quality Monitoring is Essential for Sustainable Development: Key Insights

1 May 2025Gyane
Prana Air Logo

Prana Sense

Air Quality Monitor

Air Quality Index depicts the extent of air pollution at a particular location.

Prana Sense Air Quality MonitorPrana Sense Air Quality Monitor
Prana Air Logo

Pocket PM

Air Quality Monitor

Know the air quality around you wherever you are with the Pocket monitor to get instant air quality insights.

Pocket PM Air Quality MonitorPocket PM Air Quality Monitor
Prana Air Logo

Cair +

Indoor Air Quality Monitor

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

Cair + Indoor Air Quality MonitorCair + Indoor Air Quality Monitor