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)
40
Good
Guilford, Pennsylvania
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
2.98 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
17.78 μg/m³
0
55
155
255
425
605+
43.06 ppb
0
55
71
86
201
201+
0.31 ppb
0
36
76
186
605
1005+
1.25 ppb
0
54
101
361
1250
2050+
0.22 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Guilford, Pennsylvania
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AQI 41
Good
2.15μg/m³
PM2.5
15.29μg/m³
PM10
43.66ppb
O3
0.36ppb
SO2
1.92ppb
NO2
0.21ppm
CO
AQI 40
Good
3.00μg/m³
PM2.5
10.65μg/m³
PM10
43.24ppb
O3
0.37ppb
SO2
1.85ppb
NO2
0.21ppm
CO
AQI 41
Good
1.70μg/m³
PM2.5
8.49μg/m³
PM10
43.87ppb
O3
0.38ppb
SO2
1.83ppb
NO2
0.20ppm
CO
AQI 40
Good
2.96μg/m³
PM2.5
12.22μg/m³
PM10
43.05ppb
O3
0.35ppb
SO2
1.77ppb
NO2
0.20ppm
CO
AQI 40
Good
2.98μg/m³
PM2.5
12.19μg/m³
PM10
42.85ppb
O3
0.34ppb
SO2
1.78ppb
NO2
0.20ppm
CO
AQI 40
Good
3.71μg/m³
PM2.5
16.38μg/m³
PM10
43.28ppb
O3
0.36ppb
SO2
1.40ppb
NO2
0.22ppm
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 08:00:00 on 2026-03-09.
In the last 24 hours, the best air quality in Guilford, Pennsylvania was observed at 04:00:00 on 2026-03-09.
As of now, the AQI in Guilford, Pennsylvania is 40, 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 2.977 μg/m3.
The PM10 concentration in Guilford, Pennsylvania is 17.781 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Guilford, Pennsylvania is 0.223 ppm.
Currently, Guilford, Pennsylvania has a sulfur dioxide (SO2) concentration of 0.314 ppb.
The current ozone (O3) level in Guilford, Pennsylvania at the moment is 43.058 ppm.
Nitrogen dioxide (NO2) level in Guilford, Pennsylvania at the moment is 1.245 ppb.
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