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Ontario Air Quality Index (AQI) | Air Pollution

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

Last Updated: 2026-07-31 23:21:01 (Local Time)

Live AQI

65AQI (US)

Air Quality is

Moderate

PM2.5 : 19 µg/m³

pm10 : 60 µg/m³

Good

050

Moderate

100

Poor

150

Unhealthy

200

Severe

300

Hazardous

301+

29 °C

Last Updated: 2026-07-31 23:21:01 (Local Time)

Map

Ontario

Major Air Pollutants
Ontario

Particulate Matter(PM₂.₅)

19µg/m³

Particulate Matter(PM₁₀)

60µg/m³

Carbon Monoxide(CO)

286ppb

Sulfur Dioxide(SO₂)

2ppb

Nitrogen Dioxide(NO₂)

4ppb

Ozone(O₃)

30ppb

AQI Graph

Historical Air Quality Data
Ontario

24 Hours

AQI (US)

Ontario

AQI (US)

30-07-2026Time31-07-2026

Time	Ontario
11:31pm	95
12:01am	109
12:31am	101
1:01am	139
1:31am	149
2:01am	162
2:31am	163
3:01am	163
3:31am	167
4:01am	173
4:31am	171
5:01am	168
5:31am	175
6:01am	167
6:31am	166
7:01am	164
7:31am	168
8:01am	166
8:31am	165
9:01am	163
9:31am	162
10:01am	165
10:31am	166
11:01am	158
11:31am	160
12:01pm	163
12:31pm	158
1:01pm	156
1:31pm	152
2:01pm	136
2:31pm	134
3:01pm	104
3:31pm	109
4:01pm	97
4:31pm	104
5:01pm	86
5:31pm	86
6:01pm	75
6:31pm	73
7:01pm	67
7:31pm	69
8:01pm	65
8:31pm	63
9:01pm	63
9:31pm	63
10:01pm	63
10:31pm	60
11:01pm	67
11:31pm	67

Min. AQI (US)10:31pm

175

Max. AQI (US)5:31am

Want air quality data?

AQI (US) Trends - Annual Air Quality Changes
Ontario, Oregon, United States

AQI (US)

Ontario's Locations
Real-time Air Pollution Level

locations

Status

AQI (US)

PM₂.₅(µg/m³)

PM₁₀(µg/m³)

Temp.(°C)

Humi.(%)

Northwest 6th Street

Moderate

United States's Metro Cities
Air Quality Index

Chicago

Los Angeles

Minneapolis

Nashville

New Orleans

New York City

San Francisco

Washington

Air Quality Calendar 2026
Ontario

2026

AQI (US)

Health Advice For People Living In
Ontario

2.6Cigarettes per day

Weekly 18.2 Cigarettes

Monthly 78 Cigarettes

Breathing the air in this location is as harmful as smoking 2.6 cigarettes a day.

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 PurifierTurn On

Car FilterMust

N95 MaskMust

Stay IndoorMust

Prevent Health Problems: Understand Your Risks

Ontario

Asthma

Heart Issues

Allergies

Sinus

Cold/Flu

Chronic (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

Fairbanks, Alaska

Unhealthy

4xabove Standard

Knik Fairview, Alaska

Unhealthy

4xabove Standard

Anchorage, Alaska

Unhealthy

4xabove Standard

Bellingham, Washington

Poor

3xabove Standard

Connell, Washington

Poor

1xabove Standard

Omak, Washington

Moderate

2xabove Standard

Pendleton, Oregon

Moderate

1xbelow Standard

Chelan, Washington

Moderate

2xabove Standard

Walla Walla, Washington

Moderate

1xabove Standard

10.

Socorro, Texas

Moderate

2xabove Standard

Last Updated: 01 Aug 2026, 05:36 AM

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

Monitor the air quality

Air Quality Sensors

Sensors to measure the air quality

Fresh Air Machine

Clean the air you breathe

Car Cabin Filter

Purify the air in your car

N95 Mask

Shield yourself from pollution

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

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 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

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

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

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

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

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

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

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

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

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

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

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

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

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 App

Smart TV App

Web Dashboard

API

Widgets

Air Quality FAQs
at Ontario

Frequently Asked Questions About Air Quality

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

The current real-time AQI (US) level in Ontario is 65 (Moderate). This was last updated 2026-07-31 23:21:01 (Local Time).

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

The best AQI (US) level was 60 (Moderate) at 10:31 PM, Jul 31, 2026 (Local Time) during the last 24 hours.

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

The worst AQI (US) level was 175 (Unhealthy) at 5:31 AM, Jul 31, 2026 (Local Time) during the last 24 hours.

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

The AQI (US) levels in Ontario have been fluctuating throughout the last 24 hours. The levels have increased by highest 175 at 5:31 AM, Jul 31, 2026 (Local Time), lowest 60 at 10:31 PM, Jul 31, 2026 (Local Time).

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

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