AQI PM2.5 PM10 CO SO2 NO2 O3

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St Catharines Air Quality Index (AQI) | Air Pollution

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

Last Updated: 2025-06-05 06:09:11 PM (Local Time)

Live AQI

Air Quality is

Moderate

pm10 : 15 µg/m³

PM2.5 : 9 µg/m³

Good

050

Moderate

100

Poor

150

Unhealthy

200

Severe

300

Hazardous

301+

19 °C

Last Updated: 2025-06-05 06:09:11 PM (Local Time)

Map

St Catharines

Major Air Pollutants
St Catharines

Particulate Matter(PM2.5)

9µg/m³

Particulate Matter(PM10)

15µg/m³

Carbon Monoxide(CO)

203ppb

Sulfur Dioxide(SO2)

1ppb

Nitrogen Dioxide(NO2)

4ppb

Ozone(O3)

33ppb

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AQI Graph

Historical Air Quality Data
St Catharines

24 Hours

AQI

St Catharines

Want air quality data?

AQI Trends - Annual Air Quality Changes
St Catharines, Ontario, Canada

AQI

Year

AQI

Annual AQI Trends

2020

32AQI

2021

33AQI

Rise

2022

31AQI

-6%

Fall

2023

39AQI

26%

Rise

2024

32AQI

-18%

Fall

2025

27AQI

-16%

Fall

Overall Annual Percentage (%) change of AQI in (2020 to 2025)

-2%

Fall (Improved AQI)

Most & Least Polluted Months

Most PollutedJune, 202373AQI

Least PollutedAugust, 202220AQI

* This data analysis is from year 2020 - 2025

St Catharines's Locations
Real-time Air Pollution Level

Location

Status

AQI

PM2.5(µg/m³)

PM10(µg/m³)

Temp.(°C)

Humi.(%)

Queenston

Moderate

St Catharines

Moderate

Canada's Metro Cities
Air Quality Index

Calgary

Edmonton

Halifax

Montreal

Ottawa

Toronto

West Vancouver

Windsor

Air Quality Calendar 2025
St Catharines

2025

AQI

January

Sun.	Mon.	Tue.	Wed.	Thu.	Fri.	Sat.
29 Dec -	30 Dec -	31 Dec -	1 Jan 25	2 Jan 24	3 Jan 22	4 Jan 29
5 Jan 26	6 Jan 22	7 Jan 22	8 Jan 27	9 Jan 27	10 Jan 34	11 Jan 53
12 Jan 48	13 Jan 36	14 Jan 31	15 Jan 23	16 Jan 45	17 Jan 44	18 Jan 27
19 Jan 25	20 Jan 25	21 Jan 24	22 Jan 28	23 Jan 37	24 Jan 32	25 Jan 45
26 Jan 33	27 Jan 32	28 Jan 30	29 Jan 27	30 Jan 26	31 Jan 46	1 Feb 29

February

Sun.	Mon.	Tue.	Wed.	Thu.	Fri.	Sat.
26 Jan 33	27 Jan 32	28 Jan 30	29 Jan 27	30 Jan 26	31 Jan 46	1 Feb 29
2 Feb 28	3 Feb 54	4 Feb 25	5 Feb 23	6 Feb 32	7 Feb 28	8 Feb 35
9 Feb 29	10 Feb 30	11 Feb 46	12 Feb 29	13 Feb 34	14 Feb 30	15 Feb 34
16 Feb 33	17 Feb 28	18 Feb 27	19 Feb 22	20 Feb 21	21 Feb 26	22 Feb 42
23 Feb 55	24 Feb 48	25 Feb 50	26 Feb 40	27 Feb 40	28 Feb 27	1 Mar 29

March

Sun.	Mon.	Tue.	Wed.	Thu.	Fri.	Sat.
23 Feb 55	24 Feb 48	25 Feb 50	26 Feb 40	27 Feb 40	28 Feb 27	1 Mar 29
2 Mar 27	3 Mar 30	4 Mar 35	5 Mar 32	6 Mar 25	7 Mar 32	8 Mar 33
9 Mar 30	10 Mar 32	11 Mar 31	12 Mar 28	13 Mar 26	14 Mar 53	15 Mar 54
16 Mar 27	17 Mar 16	18 Mar 21	19 Mar 28	20 Mar 24	21 Mar 17	22 Mar 17
23 Mar 19	24 Mar 21	25 Mar 20	26 Mar 19	27 Mar 21	28 Mar 26	29 Mar 25
30 Mar 28	31 Mar 22	1 Apr 16	2 Apr 19	3 Apr 26	4 Apr 17	5 Apr 19

April

Sun.	Mon.	Tue.	Wed.	Thu.	Fri.	Sat.
30 Mar 28	31 Mar 22	1 Apr 16	2 Apr 19	3 Apr 26	4 Apr 17	5 Apr 19
6 Apr 18	7 Apr 19	8 Apr 14	9 Apr 18	10 Apr 27	11 Apr 27	12 Apr 28
13 Apr 36	14 Apr 26	15 Apr 19	16 Apr 13	17 Apr 19	18 Apr 33	19 Apr 46
20 Apr 16	21 Apr 22	22 Apr 16	23 Apr 29	24 Apr 30	25 Apr 50	26 Apr 34
27 Apr 14	28 Apr 25	29 Apr 33	30 Apr 19	1 May 30	2 May 28	3 May 17

May

Sun.	Mon.	Tue.	Wed.	Thu.	Fri.	Sat.
27 Apr 14	28 Apr 25	29 Apr 33	30 Apr 19	1 May 30	2 May 28	3 May 17
4 May 17	5 May 18	6 May 19	7 May 28	8 May 17	9 May 22	10 May 24
11 May 21	12 May 27	13 May 32	14 May 19	15 May 27	16 May 27	17 May 28
18 May 17	19 May 17	20 May 14	21 May 15	22 May 13	23 May 12	24 May 13
25 May 13	26 May 19	27 May 30	28 May 23	29 May 18	30 May 31	31 May 27

June

Sun.	Mon.	Tue.	Wed.	Thu.	Fri.	Sat.
1 Jun 16	2 Jun 20	3 Jun 34	4 Jun -	5 Jun -	6 Jun -	7 Jun -
8 Jun -	9 Jun -	10 Jun -	11 Jun -	12 Jun -	13 Jun -	14 Jun -
15 Jun -	16 Jun -	17 Jun -	18 Jun -	19 Jun -	20 Jun -	21 Jun -
22 Jun -	23 Jun -	24 Jun -	25 Jun -	26 Jun -	27 Jun -	28 Jun -
29 Jun -	30 Jun -	1 Jul -	2 Jul -	3 Jul -	4 Jul -	5 Jul -

Health Advice For People Living In
St Catharines

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 PurifierTurn On
Car FilterMust
N95 MaskMust
Stay IndoorMust

Must turn on the air purifier to enjoy fresh air.

Prevent Health Problems: Understand Your Risks

St Catharines

Asthma
Heart Issues
Allergies
Sinus
Cold/Flu
Chronic (COPD)

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
Canada

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

Windsor, Canada

Yellowknife, Canada

Chatham, Canada

North Slave Region, Canada

Sarnia, Canada

Bluewater, Canada

Grand Bend, Canada

Salt River, Canada

Notre Dame du Rosaire, Canada

Moderate

4xabove Standard

10.

Sault Ste. Marie, Canada

Moderate

4xabove Standard

Last Updated: 05 Jun 2025, 09:54 PM

AQI City Rankings

Air Quality Solutions For St Catharines
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

air quality solutions for offices for St Catharines

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 institutes for St Catharines

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.

air quality solutions for airport for St Catharines

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 bathroom for St Catharines

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.

St Catharines's AQI Data Analytics Solutions
Air quality data monitoring platforms

Mobile App

Smart TV App

Web Dashboard

API

Widgets

Mobile App

Empower Your Decisions with Reliable Data

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

Personalized health advice as per current AQI.

Analytical data to identify trends and conditions.

Connect and control your air quality devices.

Air Quality FAQs
at St Catharines

Frequently Asked Questions About Air Quality

What is the current AQI level in St Catharines?

The current real-time AQI level in St Catharines is 52 (Moderate). This was last updated 2025-06-05 06:09:11 PM (Local Time).

When was the best AQI level in St Catharines in the last 24 hours?

The best AQI level was 36 (Good) at 12:09 PM (Local Time) during the last 24 hours.

When was the worst AQI level in St Catharines in the last 24 hours?

The worst AQI level was 62 (Moderate) at 8:09 PM, Jun 4, 2025 (Local Time) during the last 24 hours.

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

The AQI levels in St Catharines have been fluctuating throughout the last 24 hours. The levels have increased by highest 62 at 8:09 PM, Jun 4, 2025 (Local Time), lowest 36 at 12:09 PM (Local Time).

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

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