Real-time air quality index in St. John, Indiana today
Stay updated with real-time air quality in St. John, Indiana featuring accurate data on AQI, PM2.5, PM10, O3, NO2, SO2, and CO levels. Use our interactive map and detailed forecasts to monitor pollution trends, manage health risks, and plan your daily activities with confidence.
Live AQI (Air Quality Index)
36
Good
St. John, Indiana
Last updated: ... (Local time)
Common air pollutants in St. John, Indiana
Good
Fine
Moderate
Poor
Very poor
Hazardous
Particulate Matter2.5 (PM2.5)
5.12 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
Particulate Matter10 (PM10)
23.53 μg/m³
0
55
155
255
425
605+
Ozone (O3)
38.70 ppb
0
55
71
86
201
201+
Sulfur Dioxide (SO2)
0.43 ppb
0
36
76
186
605
1005+
Nitrogen Dioxide (NO2)
3.98 ppb
0
54
101
361
1250
2050+
Carbon Monoxide (CO)
0.16 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
St. John, Indiana
St. John, Indiana
Scroll To Air Quality Map
Track live St. John, Indiana air quality forecast and history
St. John Loading...
St. John, Indiana air quality map: Real-time AQI near you
Air quality in nearby cities
Schererville, Indiana
AQI 42
Good
4.26μg/m³
PM2.5
18.91μg/m³
PM10
45.21ppb
O3
0.49ppb
SO2
1.61ppb
NO2
0.16ppm
CO
Dyer, Indiana
AQI 42
Good
5.06μg/m³
PM2.5
22.43μg/m³
PM10
45.43ppb
O3
0.46ppb
SO2
1.74ppb
NO2
0.16ppm
CO
Crown Point, Indiana
AQI 34
Good
5.05μg/m³
PM2.5
22.90μg/m³
PM10
37.48ppb
O3
0.49ppb
SO2
2.31ppb
NO2
0.16ppm
CO
Griffith, Indiana
AQI 42
Good
4.10μg/m³
PM2.5
18.26μg/m³
PM10
44.72ppb
O3
0.52ppb
SO2
1.56ppb
NO2
0.16ppm
CO
Cedar Lake, Indiana
AQI 38
Good
5.29μg/m³
PM2.5
24.28μg/m³
PM10
40.70ppb
O3
0.46ppb
SO2
2.57ppb
NO2
0.16ppm
CO
Highland Town, Indiana
AQI 42
Good
4.33μg/m³
PM2.5
19.24μg/m³
PM10
45.32ppb
O3
0.51ppb
SO2
1.65ppb
NO2
0.16ppm
CO
How accurate is Indiana, USA air quality data?
Air quality measurements for Indiana, USA meet strict US EPA standards. These measurements are collected from reliable sources, including satellites and ground-based monitoring systems. Advanced algorithms and machine learning techniques are applied to the data, factoring in variables such as traffic and population density, to ensure precision and reliability.
Source: Ambee Data Sources
Frequently asked questions
How frequently is the air quality data for St. John, Indiana updated?
Air quality data for St. John, Indiana is updated on an hourly basis.
When did St. John, Indiana experience the worst air quality in the last 24 hours?
The worst air quality in St. John, Indiana was recorded at 03:00:00 on 2026-06-09.
When did St. John, Indiana have its best air quality in the last 24 hours?
The best air quality in St. John, Indiana was recorded at 10:00:00 on 2026-06-09.
What is the real-time air quality index for St. John, Indiana?
The real-time air quality index in St. John, Indiana is 36, currently categorized as Good.
Which pollutant is found most often in St. John, Indiana?
The most common pollutant in St. John, Indiana is O3.
What can I do if the air quality in St. John, Indiana is poor?
If the air quality in St. John, Indiana is poor, limit outdoor activities and use a mask to safeguard your health.
What are the current PM2.5 levels in St. John, Indiana?
The measured PM2.5 levels in St. John, Indiana at present are 5.122 μg/m3.
What are the current PM10 levels at St. John, Indiana?
The current PM10 levels in St. John, Indiana are 23.529 μg/m3.
What are the current carbon monoxide (CO) levels at St. John, Indiana?
The current carbon monoxide (CO) level in St. John, Indiana is 0.16 ppm.
What are the current sulfur dioxide (SO2) levels at St. John, Indiana?
The current sulfur dioxide (SO2) levels in St. John, Indiana are 0.432 ppb.
What are the current ozone (O3) levels at St. John, Indiana?
The current ozone (O3) levels at St. John, Indiana is 38.703 ppm.
What are the current nitrogen dioxide (NO2) levels at St. John, Indiana?
The current nitrogen dioxide (NO2) levels at St. John, Indiana is 3.978 ppb.
All Rights Reserved © Ambee Inc. 2025