N523HV
Cessna Citation CJ4
United States
PHX (Phoenix Sky Harbor International Airport, Phoenix)

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Viewing period:
Compared to: preceding 12 months · May 2024 – May 2025
May 2025 – Apr 2026·vs May 2024 – May 2025· Emissions increasing vs prior period

Emissions Overview

6.9
Tons CO2 This Month
Typical0.8× avg for Citation CJ4
15.9
Tons CO2 YTD
Below Average0.6× avg for Citation CJ4
70.2
CO2 Tons Since 2025
Below Average0.5× avg for Citation CJ4
Emissions Intensity0.00t CO₂/nmBelow Average0.6× avg for Citation CJ4
56.3 tons CO2 in selected period

2026 pace: On track for approximately 48t CO₂ by year end · ↓ 12% vs full year 2025 (54t)

Flight Patterns & Behaviour

Emissions up 280% vs prior period, driven by San Diego/El Cajon → Birmingham

50t
Period total CO₂
3.1t
Avg per flight
16
Flights
Moderately Concentrated3 routes account for 50% of total emissions
Highest emission route
San Diego/El Cajon → Birmingham
11.9t CO₂ total · 0.0039t CO₂/nm
🇺🇸United States·16202 aircraft tracked·Ranked 1st by emissions among 109 countries·0.2× country averageBelow Average

Subject to FAA oversight — no mandatory carbon reporting for private aviation

What's ChangedCompared to prior equivalent period
Emissions
280%
13t → 50t CO₂
Intensity
1%
0.0037 → 0.0037 t CO₂/nm
New Routes
12
41t CO₂ combined
Dropped Routes
3
Prior period only
Avg per Flight
19%
2.6t → 3.1t
Flight Count
11
5 → 16 flights

Route and airport counts may include data processing artefacts.

Spikes

Significant deviations from this aircraft's baseline in the selected period.

CO₂ Above Baseline

45t

Signals Detected

5

Highest Severity

High

Aircraft
Medium
New6 May – 12 May 2025
Elevated activity period · 2 flights in 6 days vs baseline of 0
Contributed approximately 7t CO₂ to period total — 13% of period emissions
Aircraft
High
New24 Jul – 24 Sept 2025
Elevated activity period · 6 flights in 62 days vs baseline of 3
Contributed approximately 19t CO₂ to period total — 39% of period emissions
Aircraft
Medium
Historical9 May – 18 Jun 2025
40-day inactive period
4.5t CO₂ in the 7 days following resumption
Aircraft
Medium
Historical18 Jun – 30 Jul 2025
41-day inactive period
11.0t CO₂ in the 7 days following resumption
Aircraft
Medium
Historical5 Aug – 22 Aug 2025
17-day inactive period
4.0t CO₂ in the 7 days following resumption
Recent Flights
Feb 26, 20263.2t CO₂
KCYSCheyenne
KBHMBirmingham
1,118 miles2h 10m
Jan 29, 20264.0t CO₂
KPHXPhoenix
KBHMBirmingham
1,450 miles2h 37m
Jan 12, 20261.9t CO₂
KDSMDes Moines
KBHMBirmingham
668 miles1h 23m
Jan 4, 20262.3t CO₂
KBCTBoca Raton
KBHMBirmingham
635 miles1h 37m
View Details
Dec 5, 20251.7t CO₂
KVDFLakeland
KEKYBessemer
456 miles1h 15m
View Details
Dec 2, 20255.0t CO₂
KSEESan Diego/El Cajon
KBHMBirmingham
1,741 miles3h 14m
View Details
Nov 17, 20251.2t CO₂
KSAVSavannah
KBHMBirmingham
337 miles59m
View Details
Sep 21, 20253.7t CO₂
KSLNSalina
KBOIBoise
1,019 miles2h 27m
View Details
Sep 17, 20250.5t CO₂
KBFMMobile
KBHMBirmingham
217 miles35m
View Details
Aug 27, 20252.1t CO₂
KIADWashington
KBHMBirmingham
637 miles1h 30m
View Details
Aug 22, 20252.0t CO₂
KCIDCedar Rapids
KBHMBirmingham
635 miles1h 25m
View Details
Aug 5, 20254.1t CO₂
KPHXPhoenix
KGTRColumbus/W Point/Starkville
1,346 miles2h 40m
View Details
Jul 30, 20256.9t CO₂
KSEESan Diego/El Cajon
KBHMBirmingham
1,741 miles4h 22m
View Details
Jun 18, 20254.5t CO₂
KPHXPhoenix
KBHMBirmingham
1,450 miles2h 57m
View Details
May 9, 20254.3t CO₂
KPHXPhoenix
KJFXJasper
1,415 miles2h 49m
View Details
May 6, 20252.2t CO₂
KIADWashington
KBHMBirmingham
637 miles1h 35m
View Details
Mar 15, 20254.3t CO₂
KPHXPhoenix
KBHMBirmingham
1,450 miles2h 49m
View Details
Mar 7, 20251.8t CO₂
KROARoanoke
KBHMBirmingham
461 miles1h 21m
View Details
Feb 19, 20250.9t CO₂
KBNANashville
KINDIndianapolis
249 miles48m
View Details
Feb 1, 20254.6t CO₂
KPHXPhoenix
KBHMBirmingham
1,450 miles2h 59m
View Details
Jan 2, 20251.4t CO₂
KBHMBirmingham
KINDIndianapolis
426 miles1h 6m
View Details
Top Airports by Emissions
Birmingham

Birmingham

KBHM

Total CO₂

35.8t

Total Visits

12

Avg CO₂/visit

3.0t

May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Apr
Phoenix

Phoenix

KPHX

Total CO₂

16.9t

Total Visits

4

Avg CO₂/visit

4.2t

May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Apr
San Diego/El Cajon

San Diego/El Cajon

KSEE

Total CO₂

11.9t

Total Visits

2

Avg CO₂/visit

6.0t

May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Apr
Washington

Washington

KIAD

Total CO₂

4.3t

Total Visits

2

Avg CO₂/visit

2.2t

May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Apr
Jasper

Jasper

KJFX

Total CO₂

4.3t

Total Visits

1

Avg CO₂/visit

4.3t

May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Apr
Columbus/W Point/Starkville

Columbus/W Point/Starkville

KGTR

Total CO₂

4.1t

Total Visits

1

Avg CO₂/visit

4.1t

May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Apr
Page 1 of 3
Top Routes by Emissions
San Diego/El Cajon Birmingham

KSEE to KBHM1,742 miles

Total Flights

2

Avg CO₂/Flight

6.0t

Total Emissions

11.9t CO₂

May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Apr
Phoenix Birmingham

KPHX to KBHM1,451 miles

Total Flights

2

Avg CO₂/Flight

4.2t

Total Emissions

8.5t CO₂

May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Apr
Washington Birmingham

KIAD to KBHM638 miles

Total Flights

2

Avg CO₂/Flight

2.2t

Total Emissions

4.3t CO₂

May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Apr
Phoenix Jasper

KPHX to KJFX1,416 miles

Total Flights

1

Avg CO₂/Flight

4.3t

Total Emissions

4.3t CO₂

May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Apr
Phoenix Columbus/W Point/Starkville

KPHX to KGTR1,347 miles

Total Flights

1

Avg CO₂/Flight

4.1t

Total Emissions

4.1t CO₂

May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Apr
Salina Boise

KSLN to KBOI1,019 miles

Total Flights

1

Avg CO₂/Flight

3.7t

Total Emissions

3.7t CO₂

May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Apr
Page 1 of 3