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Live

St Catharines Air Quality Index (AQI) | Air Pollution

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

Last Updated: 2025-07-17 06:54:14 PM (Local Time)

location image
Live AQI
30
Air Quality is
Good
pm10 :  24 µg/m³
PM2.5 :  5 µg/m³
Good
050
Moderate
100
Poor
150
Unhealthy
200
Severe
300
Hazardous
301+
aqi good level.webp in St Catharines
partly cloudy

26 °C

Partly cloudy
Humidity
Humidity61 %

Wind Speed
Wind Speed32 km/h

UV Index
UV Index3
Last Updated: 2025-07-17 06:54:14 PM (Local Time)
AQI LogoMap

St Catharines

Major Air Pollutants

St Catharines

PM2.5's Icon

Particulate Matter(PM2.5)

5µg/m³

PM10's Icon

Particulate Matter(PM10)

24µg/m³

CO's Icon

Carbon Monoxide(CO)

165ppb

SO2's Icon

Sulfur Dioxide(SO2)

1ppb

NO2's Icon

Nitrogen Dioxide(NO2)

3ppb

O3's Icon

Ozone(O3)

30ppb

Trending in Canada

Is Poor Air Quality in Gyms Holding Back Your Fitness Goals?

Is Poor Air Quality in Gyms Holding Back Your Fitness Goals?

City Climate Change Severity Analysis is NOW LIVE on AQI.in!📢

City Climate Change Severity Analysis is NOW LIVE on AQI.in!📢

AQI Graph

Historical Air Quality Data

St Catharines

24 Hours
AQI
St Catharines
AQI
.
16-07-2025Time17-07-2025
TimeSt Catharines
07 PM62
08 PM60
09 PM60
10 PM58
11 PM54
12 AM54
01 AM54
02 AM43
03 AM36
04 AM30
05 AM24
06 AM24
07 AM23
08 AM27
09 AM30
10 AM32
11 AM32
12 PM30
01 PM31
02 PM30
03 PM24
04 PM26
05 PM30
06 PM31
23
Min.at 7:09 AM on 17th Jul
62
Max.at 7:09 PM on 16th Jul

Want air quality data?

AQI Logo

Download 2024 Annual Data

World Air Quality Report

Globe

AQI Trends - Annual Air Quality Changes

St Catharines, Ontario, Canada

AQI
Year
.
AQI
AQI AQI
Mar 202032
Apr 202034
May 202035
Jun 202036
Jul 202034
Aug 202031
Sep 202029
Oct 202028
Nov 202032
Dec 202034
Jan 202137
Feb 202138
Mar 202137
Apr 202135
May 202134
Jun 202134
Jul 202136
Aug 202132
Sep 202124
Oct 202132
Nov 202130
Dec 202131
Jan 202234
Feb 202234
Mar 202234
Apr 202231
May 202231
Jun 202232
Jul 202242
Aug 202220
Sep 202224
Oct 202230
Nov 202229
Dec 202229
Jan 202335
Feb 202334
Mar 202337
Apr 202337
May 202336
Jun 202373
Jul 202347
Aug 202341
Sep 202335
Oct 202326
Nov 202330
Dec 202336
Jan 202433
Feb 202437
Mar 202429
Apr 202430
May 202433
Jun 202434
Jul 202436
Aug 202435
Sep 202431
Oct 202428
Nov 202423
Dec 202429
Jan 202531
Feb 202534
Mar 202527
Apr 202524
May 202521
Jun 202543
Jul 202545


Annual AQI Trends

2020
32AQI
2021
33AQI
3%
Rise
2022
31AQI
-6%
Fall
2023
39AQI
26%
Rise
2024
32AQI
-18%
Fall
2025
31AQI
-3%
Fall
Overall Annual Percentage (%) change of AQI in (2020 to 2025)
0%
No Change

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
Good
30
5
24
27
83
St Catharines
Good
30
5
24
27
83

Canada's Metro Cities

Air Quality Index

Calgary City AQI

Calgary

50

temp.14°C

hum.88%
Edmonton City AQI

Edmonton

40

temp.23°C

hum.37%
Halifax City AQI

Halifax

22

temp.19°C

hum.90%
Montreal City AQI

Montreal

44

temp.28°C

hum.81%
Ottawa City AQI

Ottawa

51

temp.24°C

hum.100%
Toronto City AQI

Toronto

39

temp.24°C

hum.65%
Vancouver City AQI

Vancouver

41

temp.26°C

hum.42%
Windsor City AQI

Windsor

44

temp.26°C

hum.60%

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
55
5 Jun
48
6 Jun
58
7 Jun
58
8 Jun
74
9 Jun
60
10 Jun
41
11 Jun
53
12 Jun
64
13 Jun
39
14 Jun
29
15 Jun
37
16 Jun
35
17 Jun
33
18 Jun
36
19 Jun
25
20 Jun
34
21 Jun
49
22 Jun
52
23 Jun
53
24 Jun
55
25 Jun
44
26 Jun
38
27 Jun
35
28 Jun
30
29 Jun
36
30 Jun
42
1 Jul
36
2 Jul
40
3 Jul
47
4 Jul
31
5 Jul
53
July
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
29 Jun
36
30 Jun
42
1 Jul
36
2 Jul
40
3 Jul
47
4 Jul
31
5 Jul
53
6 Jul
51
7 Jul
47
8 Jul
29
9 Jul
37
10 Jul
46
11 Jul
52
12 Jul
44
13 Jul
39
14 Jul
48
15 Jul
59
16 Jul
61
17 Jul
-
18 Jul
-
19 Jul
-
20 Jul
-
21 Jul
-
22 Jul
-
23 Jul
-
24 Jul
-
25 Jul
-
26 Jul
-
27 Jul
-
28 Jul
-
29 Jul
-
30 Jul
-
31 Jul
-
1 Aug
-
2 Aug
-
Good
050
Moderate
100
Poor
150
Unhealthy
200
Severe
300
Hazardous
301+

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


As per the current AQI, turn off the air purifier.

Get an Air Purifier

Prevent Health Problems: Understand Your Risks

St Catharines

  • asthma due to air pollution in St CatharinesAsthma
  • heart due to air pollution in St CatharinesHeart Issues
  • allergy due to air pollution in St CatharinesAllergies
  • sinus due to air pollution in St CatharinesSinus
  • flu due to air pollution in St CatharinesCold/Flu
  • copd due to air pollution in St CatharinesChronic (COPD)
asthma due to air pollution in St Catharines

Low Chances of Asthma

Asthma

Risk of Asthma symptoms is Low when AQI is Good (0-50)

Mild symptoms such as slight wheezing, occasional cough, and minor shortness of breath

Do's :

  • Keep track of air quality to plan outdoor activities safely.

  • Drink water to keep airways moist and reduce irritation.

  • Include non-allergenic fruits and vegetables that support overall lung health, like apples, pears, and spinach.

Don'ts :

  • Skip medications that is prescribed by your doctor.

  • Engage in outdoor activities in early morning during high pollen hours.

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

Follow

1.

Prince Albert, Canada

69
Moderate
5xabove Standard

2.

Buffalo Narrows, Canada

69
Moderate
5xabove Standard

3.

Yorkton, Canada

65
Moderate
4xabove Standard

4.

Regina, Canada

65
Moderate
4xabove Standard

5.

Bratts Lake No 129, Canada

64
Moderate
4xabove Standard

6.

Meadow Lake, Canada

64
Moderate
4xabove Standard

7.

Brandon, Canada

64
Moderate
4xabove Standard

8.

Estevan, Canada

64
Moderate
4xabove Standard

9.

Flin Flon, Canada

64
Moderate
4xabove Standard

10.

Flin Flon, Canada

64
Moderate
4xabove Standard

Last Updated: 17 Jul 2025, 10:02 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

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 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 for St Catharines

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 for St Catharines

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 St Catharines

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 St Catharines

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 St Catharines

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 St Catharines

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 St Catharines

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 for St Catharines

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 St Catharines

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 for St Catharines

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 St Catharines

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 St Catharines

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

Empower Your Decisions with Reliable Data

Get it onApp Store
Get it onGoogle Play
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 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 30 (Good). This was last updated 2025-07-17 06:54:14 PM (Local Time).

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

The best AQI level was 23 (Good) at 7:09 AM (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 7:09 PM, Jul 16, 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 7:09 PM, Jul 16, 2025 (Local Time), lowest 23 at 7:09 AM (Local Time).

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

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

Recent AQI Blogs

Read the latest news

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

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Do People Really Consider Air Pollution Before Moving to Delhi NCR?

15 Jul 2025Shakshi
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Air Pollution Comparison Between England vs India: What a 45% Asthma Spike in the UK Reveals

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24 Jun 2025Shakshi
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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
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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
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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