Stay updated with real-time air quality in Guilford, Pennsylvania 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)
43
Good
Guilford, Pennsylvania
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
3.46 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
15.93 μg/m³
0
55
155
255
425
605+
45.70 ppb
0
55
71
86
201
201+
0.37 ppb
0
36
76
186
605
1005+
2.24 ppb
0
54
101
361
1250
2050+
0.16 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Guilford, Pennsylvania
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AQI 42
Good
3.50μg/m³
PM2.5
16.00μg/m³
PM10
45.00ppb
O3
0.37ppb
SO2
2.21ppb
NO2
0.16ppm
CO
AQI 44
Good
3.40μg/m³
PM2.5
16.20μg/m³
PM10
46.88ppb
O3
0.37ppb
SO2
2.30ppb
NO2
0.16ppm
CO
AQI 40
Good
3.43μg/m³
PM2.5
13.62μg/m³
PM10
43.27ppb
O3
0.37ppb
SO2
2.22ppb
NO2
0.16ppm
CO
AQI 46
Good
3.60μg/m³
PM2.5
13.35μg/m³
PM10
50.02ppb
O3
0.38ppb
SO2
1.98ppb
NO2
0.16ppm
CO
AQI 46
Good
3.60μg/m³
PM2.5
13.25μg/m³
PM10
50.17ppb
O3
0.38ppb
SO2
1.98ppb
NO2
0.16ppm
CO
AQI 42
Good
3.53μg/m³
PM2.5
15.64μg/m³
PM10
45.19ppb
O3
0.30ppb
SO2
2.80ppb
NO2
0.16ppm
CO
Air quality and pollutant data for Pennsylvania, USA are sourced from ground-based monitors and satellites, adhering to US EPA standards. Machine learning and advanced algorithms enhance the data by incorporating local variables like traffic and population density, ensuring high accuracy and dependability.
Source: Ambee Data Sources
The air quality information for Guilford, Pennsylvania is updated every hour for accuracy.
In the past 24 hours, the air quality in Guilford, Pennsylvania was at its worst at 01:00:00 on 2026-07-23.
In the last 24 hours, the best air quality in Guilford, Pennsylvania was observed at 12:00:00 on 2026-07-23.
As of now, the AQI in Guilford, Pennsylvania is 43, indicating Good conditions.
Guilford, Pennsylvania air has the highest levels of O3.
Poor air quality in Guilford, Pennsylvania means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in Guilford, Pennsylvania are currently 3.461 μg/m3.
The PM10 concentration in Guilford, Pennsylvania is 15.933 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Guilford, Pennsylvania is 0.158 ppm.
Currently, Guilford, Pennsylvania has a sulfur dioxide (SO2) concentration of 0.372 ppb.
The current ozone (O3) level in Guilford, Pennsylvania at the moment is 45.695 ppm.
Nitrogen dioxide (NO2) level in Guilford, Pennsylvania at the moment is 2.237 ppb.
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