Bethlehem, Pennsylvania, United States Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
March Air Quality Analysis
Bethlehem, Pennsylvania, United States
AQI Trends: Highest and Lowest
Same Day Analysis (10th March):
On this day, AQI across the 5 years varied significantly: 2026 ranks 3rd highest AQI at 32 of Good air quality, showing improvement over 2023 and 2022 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 9th Mar - 10th Mar 2026
Bethlehem, Pennsylvania, United States
6 AM9th Mar 2026
5 PM
5 AM10th Mar 2026
51AQI
28AQI
38AQI
16AQI
In the last 24 hours,
Bethlehem's AQI reached its highest point of 51 at 3 PM during the Day, while the lowest point, 16, was recorded at 4 AM during the Night between 9th Mar and 10th Mar 2026.
Day & Night AQI Trend : Feb - Mar 2026
Bethlehem, Pennsylvania, United States
-9°C-16/-1°C
-3°C-9/2°C
1°C-2/5°C
-1°C-3/2°C
-1°C-5/5°C
1°C-6/13°C
1°C-7/8°C
1°C-1/4°C
4°C1/9°C
3°C0/8°C
3°C2/5°C
3°C1/4°C
4°C0/7°C
1°C-1/4°C
0°C-2/4°C
-4°C-7/1°C
2°C-5/9°C
4°C-2/13°C
3°C-5/13°C
6°C-3/18°C
3°C-4/9°C
-1°C-6/7°C
0°C-2/2°C
6°C2/12°C
6°C4/7°C
5°C3/6°C
5°C3/8°C
12°C7/19°C
13°C0/25°C
16°C7/29°C
62AQI
35AQI
49AQI
37AQI
2026 Days Vs Air Quality
Bethlehem, Pennsylvania, United States
88%
61
12%
8
Total number of days with different AQI categories in last 70 days in 2026 (295 days remaining)
Under WHO’s Safe Air Quality Limits: 88%
Health Risk Level:
Low
In 2026, 88% of 70 days were within WHO’s safe air quality limits. The risk of health issues is Low, but the long-term effects, especially on vulnerable individuals, remain uncertain.
Annual Air Quality Insights
Bethlehem, Pennsylvania, United States
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
19AQI (US)
22AQI (US)
28AQI (US)
42AQI (US)
32AQI (US)
67AQI (US)
60AQI (US)
22AQI (US)
45AQI (US)
32AQI (US)
22AQI (US)
17AQI (US)
34AQI (US)
45AQI (US)
36AQI (US)
18AQI (US)
46AQI (US)
92AQI (US)
33AQI (US)
25AQI (US)
42AQI (US)
49AQI (US)
52AQI (US)
48AQI (US)
48AQI (US)
47AQI (US)
41AQI (US)
47AQI (US)
52AQI (US)
57AQI (US)
44AQI (US)
45AQI (US)
48AQI (US)
47AQI (US)
46AQI (US)
45AQI (US)
44AQI (US)
39AQI (US)
47AQI (US)
47AQI (US)
45AQI (US)
41AQI (US)
39AQI (US)
47AQI (US)
49AQI (US)
46AQI (US)
43AQI (US)
58AQI (US)
47AQI (US)
42AQI (US)
43AQI (US)
43AQI (US)
43AQI (US)
38AQI (US)
44AQI (US)
44AQI (US)
34AQI (US)
33AQI (US)
34AQI (US)
38AQI (US)
55AQI (US)
46AQI (US)
43AQI (US)
39AQI (US)
33AQI (US)
36AQI (US)
37AQI (US)
36AQI (US)
32AQI (US)
41AQI (US)
44AQI (US)
40AQI (US)
No. of days
202642AQI (US)
Highest AQI (US) recorded in
February44AQI (US)
Lowest AQI (US) recorded in
March40AQI (US)
202534AQI (US)
Highest AQI (US) recorded in
June42AQI (US)
Lowest AQI (US) recorded in
May23AQI (US)
202433AQI (US)
Highest AQI (US) recorded in
February38AQI (US)
Lowest AQI (US) recorded in
November27AQI (US)
202340AQI (US)
Highest AQI (US) recorded in
June70AQI (US)
Lowest AQI (US) recorded in
October28AQI (US)
202238AQI (US)
Highest AQI (US) recorded in
December47AQI (US)
Lowest AQI (US) recorded in
September31AQI (US)
202140AQI (US)
Highest AQI (US) recorded in
July50AQI (US)
Lowest AQI (US) recorded in
September33AQI (US)
202036AQI (US)
Highest AQI (US) recorded in
December46AQI (US)
Lowest AQI (US) recorded in
May30AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Bethlehem's annual 2026 AQI (US) (42) shows an average percentage change of 14.04% (worsened AQI (US)) compared to previous years: 2020 (36), 2021 (40), 2022 (38), 2023 (40), 2024 (33), 2025 (34).