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4th Quarter 2016 Report

Fly Quiet Program O’Hare International Airport

Visit the O’Hare Noise Webpage on the Internet at www.flychicago.com/ORDNoise 4th Quarter 2016 Report

Background

On June 17, 1997, the City of Chicago announced that airlines operating at O’Hare International Airport had agreed to use designated noise abatement flight procedures in accordance with the Fly Quiet Program. The Fly Quiet Program was implemented in an effort to further reduce the impacts of aircraft noise on the surrounding neighborhoods.

The Fly Quiet Program is a voluntary program that encourages pilots and air traffic controllers to use designated nighttime preferential runways and flight tracks developed by the Chicago Department of Aviation in cooperation with the O'Hare Noise Compatibility Commission, the airlines, and the air traffic controllers. These preferred routes direct aircraft over less-populated areas, such as forest preserves, highways, as well as commercial and industrial areas.

As part of the Fly Quiet Program, the Chicago Department of Aviation prepares a Quarterly Fly Quiet Report. This report is shared with Chicago Department of Aviation officials, the O'Hare Noise Compatibility Commission, the airlines, and the general public. The Fly Quiet Report contains detailed information regarding nighttime runway use, flight operations, flight tracks, and noise complaints and 24-hour tracking of ground run-ups. The data presented in this report is compiled from the Airport Noise Management System (ANMS) and airport operation logs.

Operations

O’Hare has seven runways that are all utilized at different times depending on a number of conditions including weather, airfield pavement and construction activities and air traffic demand.

The Nighttime Runway Use Report compares the average percentage of use for each runway during the current quarter with the previous quarter as well as with the 12-month average. The percentage of use for departures and arrivals is shown graphically for each runway. This data is presented for all aircraft types during nighttime hours of 10:00 p.m. to 7:00 a.m. The Nighttime Hourly Operations Report compares the arrivals and departures by hour to the current quarter with the previous quarter as well as with the 12- month average. Percentage is a ratio whereas a percentage point is the difference between two percentages.

Highlights for 4Q 2016 include:

Departures Arrivals Most used nighttime departure runway: 28R – 32% Most used nighttime arrival runway: 27L – 34% 28C night departures increased by 11pp from 3Q 2016 28C night arrivals increased by 8pp from 3Q 2016 33 night departures decreased by 8pp from 3Q 2016 10C night arrivals decreased 7pp from 3Q 2016 pp = Percentage Points Nighttime operations represent 10% of the overall daily operations

Arrival Summary

A summary of nighttime arrivals is provided for the two most-used arrival runways (28C and 27L); the airline summary is also compared to the data from the same quarter of the previous year.

Preferential Flight Tracks

As part of the Fly Quiet Program, the Chicago Department of Aviation worked with the O'Hare Noise Compatibility Commission, the airlines, and the air traffic controllers to identify preferred runways and flight

Chicago Department of Aviation Page 1 4th Quarter 2016 tracks for nighttime operations at O’Hare. The preferred routes direct aircraft over less-populated areas in an effort to limit the effects of noise on the surrounding communities.

Adherence to nighttime departure preferential flight tracks is measured by the ANMS. A detailed airline deviation summary is provided for the two most-used departure runways (22L and 28R); the airline deviation is also compared to the data from the same quarter of the previous year.

An average deviation graphic and table is provided for all runways. The Nighttime Flight Track Report measures deviation (in nautical miles) from the preferred flight tracks and is divided into three categories:

 less than 0.5 miles  between 0.5 and 1.0 miles  greater than 1.0 miles

Noise Complaints

The Chicago Department of Aviation maintains a toll-free O’Hare noise hotline (1-800-435-9569) and an on-line service at www.flychicago.com/ORDNoise for citizens to express their concerns about particular incidents or about aircraft noise levels in general. The Nighttime Noise Complaint Report summarizes the number of complaints received and where the complainants were located. The tabular report lists the number of complaints by community as well as the number of individual complainants. The graph at the bottom of the page illustrates the nature of the complaints during the current quarter. Complaints include all complaints made within the State of to the O’Hare Noise Hotline toll-free number or on-line feature.

Ground Run-ups

Ground run-ups are aircraft engine tests that are performed to ensure that the engines are working properly after maintenance is performed. Ground run-ups typically occur at night and generate high levels of noise for extended periods of time. In 1997, the Chicago Department of Aviation constructed a ground run-up enclosure (GRE) at O’Hare to help reduce the noise impacts of ground run-ups on the communities surrounding the airport. This facility was the first of its kind in the United States. When it is not possible to use the GRE, run-ups are performed on one of the three identified alternative locations.

The Airline Ground Run-up Report displays the total number of ground run ups from the current quarter by airline. The Aircraft Ground Run-up Report displays the total number of ground run ups from the current quarter by aircraft. Both reports compare the percent utilization of the GRE facility to the percent utilization of other locations for ground run-ups. It also compares the current quarter’s GRE usage to the 12-month average and to the same quarter of the previous year.

Aircraft Noise

The Nighttime Aircraft Noise Report summarizes noise measurements from each of the 33 noise monitors located around O’Hare. The data presented summarizes the Equivalent Sound Level (Leq). Leq is used to identify the average sound level over a given period of time (in this case 10 p.m. to 7 a.m.) and is the metric used for this analysis as it is the most appropriate noise measure for periods of time less than 24 hours.

The data in this report displays the average Leq for the current quarter and its comparison to the previous four quarters. It also compares the current quarter’s Leq to the 12-month average. Numbers displayed in red represent an increase of at least 1 dB over the aircraft Leq from the same quarter of the previous year whereas numbers displayed in green represent a decrease of at least 1 dB from the aircraft Leq from the same quarter of the previous year.

Chicago Department of Aviation Page 2 4th Quarter 2016 Runway Use Report Chicago O'Hare International Airport Period: 4th Quarter 2016 Time of Day: 10:00 p.m. to 7:00 a.m.

Runway Use (10 p.m. to 7 a.m.) Source: Airport Noise Management System (ANMS) Runway Utilization 4L 4R 9L 9R 10L 10C 10R 15 22L 22R 27L 27R 28L 28C 28R 33 Average Daily Departures 4Q 2016 0 0 0 12 4 4 0 1 19 0 0 0 0 15 31 12 3Q 2016 1 0 0 21 14 4 0 2 20 0 0 0 0 5 33 25 12 Month Avg. 0 0 0 17 8 2 0 0 14 0 0 0 0 6 35 23 Average Daily Arrivals 4Q 2016 0 1 4 2 3 16 0 4 0 10 43 4 0 31 8 n/a 3Q 2016 0 5 8 5 7 29 0 4 1 11 39 3 0 25 10 n/a 12 Month Avg. 0 1 6 2 10 21 0 2 0 3 46 3 0 28 10 n/a

Departures (10 p.m. to 7 a.m.) Arrivals (10 p.m. to 7 a.m.) 80% 80%

70% 70%

60% 60%

50% 50%

40% 40%

30% 30%

20% 20%

10% 10%

0% 0%

Percentage Departure Utilization Percentage Arrival Utilization 4Q 2016 4Q 2016 0 0 # 8

0 0 3 3

12 3

0 12 1 34

0 1 2 32 4 6

1 4 13 25 0 0 0 0 # 0 0 0 19 2 1

Chicago Department of Aviation Page 3 4th Quarter 2016 Nighttime Hourly Operations Report Chicago O'Hare International Airport Period: 4th Quarter 2016 Time of Day: 10:00 p.m. to 7:00 a.m.

Average Departures by Hour

70

60 49 50

33 40 33 31

30 Average Departures Average 18 20 12 8 9

10 6 7 4 3 4 3 2 2 1 1

10 p.m. 11 p.m. 12 a.m. 1 a.m. 2 a.m. 3 a.m. 4 a.m. 5 a.m. 6 a.m.

Hour

4Q16 3Q16 12 Month Average*

Operations by Hour (%) 4Q 2016 10 p.m. 11 p.m 12 a.m. 1 a.m. 2 a.m. 3 a.m. 4 a.m. 5 a.m. 6 a.m. Total Departures 33.0% 12.4% 6.2% 3.7% 2.7% 1.7% 1.1% 8.4% 30.8% 100% Arrivals 16.4% 11.6% 4.5% 1.6% 0.9% 2.3% 9.0% 17.6% 36.1% 100%

Average Arrivals by Hour

70

55 60 46 50

40 21

Average Arrivals Average 30 23 22 25 17 15 20 9 11 12 6 10 4 2 1 1 3 2 0 10 p.m. 11 p.m. 12 a.m. 1 a.m. 2 a.m. 3 a.m. 4 a.m. 5 a.m. 6 a.m.

Hour

4Q16 3Q16 12 Month Average*

* 12 Month Average equals the average of 1Q 2016, 2Q 2016, 3Q 2016 and 4Q 2016.

Chicago Department of Aviation Page 4 4th Quarter 2016 Nighttime Arrival Summary Chicago O'Hare International Airport Period: 4th Quarter 2016 Time of Day: 11:00 p.m. to 6:00 a.m.

4th Quarter 2016 4th Quarter 2015 Runway 27L Arrivals Arrivals Arrivals Airline AeroMexico 58 33 Air Choice One 11 29 21 252 186 2 1 1 -- 1 -- 14 12 30 8 Envoy Air 283 139 FedEx 10 -- Frontier Airlines 54 33 General Aviation 58 14 -- JetBlue Airways 4 4 Polar Air Cargo 1 -- Company 1 1 Republic Airlines 27 16 Sky West Aviation 85 36 Spirit Airlines 73 75 Swift Air 3 4 359 267 United Express/ASA 96 33 United Express/Gojet 17 17 United Express/Shuttle America 5 10 United Express/Trans States 31 8 UPS 10 2 Virgin America 18 17 1 -- Total 1,485 932

Chicago Department of Aviation Page 5 4th Quarter 2016 Nighttime Arrival Summary Chicago O'Hare International Airport Period: 4th Quarter 2016 Time of Day: 11:00 p.m. to 6:00 a.m.

4th Quarter 2016 4th Quarter 2015 Runway 28C Arrivals Arrivals Arrivals Airline AeroMexico 35 27 AeroUnion 7 2 Cargo 10 6 Air Choice One 1-- 14 4 AirBridge Cargo Airlines 24 7 Alaska Airlines 9 14 America West Airlines 1 -- American Airlines 191 268 7 8 Atlas Air 38 2 Airlines 33 17 Airways 3 3 China Airlines 9 5 China Southern Airlines 7 1 Copa Airlines 8 9 Delta Air Lines 15 6 Delta Connection 2 -- 6 5 Envoy Air 121 259 Eva Airways 2 -- FedEx 93 74 Frontier Airlines 40 26 General Aviation 64 Interjet 6 -- JetBlue Airways 1 1 Kalitta Air 4 1 Kalitta Charters 1 -- Lines 14 4 1 -- 7 5 National Air Cargo 1 2 Nippon Cargo Airlines 8 2 Polar Air Cargo 10 3 PSA Airlines 9 -- Airways 3 3 Qatar Airways 16 9 Republic Airlines 40 45 1 -- Sky Regional Airlines 1 -- Sky West Aviation 48 46 Spirit Airlines 35 61 Swift Air 5 3 United Airlines 264 261 United Express/ASA 11 30 United Express/Gojet 22 14 United Express/Shuttle America 18 13 United Express/Trans States 12 10 UPS 71 54 Virgin America 9 13 Yangtze River Express Airlines 2 1 Total 1,302 1,328

Chicago Department of Aviation Page 6 4th Quarter 2016 Nighttime Preferential Flight Track Summary Chicago O'Hare International Airport Period: 4th Quarter 2016 Time of Day: 11:00 p.m. to 6:00 a.m.

4th Quarter 2016 4th Quarter 2015 Runway 22L Departures Average Average Departures Deviation Departures Deviation Airline (nautical miles) (nautical miles) AeroMexico 17 0.18 32 0.14 AirBridge Cargo Airlines 2 0.28 -- -- America West Airlines 1 0.39 -- -- American Airlines 101 0.29 113 0.30 Asiana Airlines 6 0.29 -- -- Atlas Air 7 0.15 1 0.04 Cargolux Airlines 5 0.42 1 2.12 Cathay Pacific Airways 1 0.74 -- -- Delta Air Lines 3 0.65 18 0.32 Delta Private Jets 2 0.29 -- -- Emirates 2 0.15 -- -- Envoy Air 13 0.39 7 0.41 FedEx 32 0.27 11 0.24 2 0.10 -- -- Frontier Airlines 4 0.13 4 0.31 General Aviation 4 0.55 5 0.38 Interjet 1 0.42 -- -- Korean Air Lines 4 0.14 -- -- National Air Cargo 1 0.32 -- -- Nippon Cargo Airlines 5 0.19 4 0.33 Polar Air Cargo 1 0.27 -- -- Republic Airlines 11 0.54 3 0.42 Sky Regional Airlines 1 1.05 1 0.13 Sky West Aviation 13 0.47 17 0.38 Spirit Airlines 42 0.37 50 0.43 Swift Air 1 0.08 2 0.20 United Air Lines 72 0.23 40 0.33 United Express/ASA 11 0.36 7 0.33 United Express/Gojet 8 0.40 9 0.27 United Express/Shuttle America 2 0.50 2 0.84 United Express/Trans States 4 0.13 5 0.26 UPS 17 0.47 10 0.31 Overall 396 0.35 342 0.40 Green represents a deviation of less than 0.5 nautical miles

Orange represents a deviation between 0.5 and 1.0 nautical miles

Red represents a deviation greater than 1.0 nautical mile

Chicago Department of Aviation Page 7 4th Quarter 2016 Nighttime Preferential Flight Track Summary Chicago O'Hare International Airport Period: 4th Quarter 2016 Time of Day: 11:00 p.m. to 6:00 a.m.

4th Quarter 2016 4th Quarter 2015 Runway 28R Departures Average Average Departures Deviation Departures Deviation Airline (nautical miles) (nautical miles) Aerologic 4 0.37 8 0.38 AeroMexico 32 0.17 56 0.17 AeroUnion 2 0.48 3 0.13 1 0.06 -- -- Air China Cargo 8 0.26 21 0.34 2 0.16 1 0.30 AirBridge Cargo Airlines 16 0.41 18 0.46 Alaska Airlines 1 0.08 1 0.48 American Airlines 82 0.33 117 0.27 Asiana Airlines 39 0.29 41 0.35 Atlas Air 14 0.19 2 0.69 2 0.45 -- -- Cargolux Airlines 10 0.39 34 0.26 Cathay Pacific Airways 8 0.27 14 0.21 China Airlines 1 0.36 -- -- 2 0.15 14 0.29 China Southern Airlines 5 0.46 -- -- Delta Air Lines 9 0.32 8 0.27 Emirates 10 0.40 20 0.38 Envoy Air 38 0.23 16 0.33 Eva Airways 22 0.42 3 0.17 FedEx 33 0.23 30 0.29 Frontier Airlines 3 0.35 3 0.19 JetBlue Airways 1 2.24 3 0.12 Kalitta Air 4 0.37 3 0.47 Korean Air Lines 14 0.24 42 0.20 LOT 3 0.37 3 0.31 Lufthansa 2 1.93 1 0.09 Lufthansa Cargo 6 0.41 17 0.35 National Air Cargo 1 1.11 2 0.12 Nippon Cargo Airlines 14 0.26 32 0.32 Polar Air Cargo 3 0.17 5 0.12 Qantas Airways 5 0.54 9 0.57 Qatar Airways 9 0.28 12 0.39 Republic Airlines 13 0.16 1 0.05 Royal Jordanian 4 0.39 3 0.34 3 0.37 8 0.31 Sky West Aviation 36 0.44 4 1.01 Spirit Airlines 39 0.24 42 0.34 3 0.46 4 0.34 United Air Lines 145 0.46 83 0.38 United Express/ASA 20 0.43 7 0.30 United Express/Gojet 12 0.15 11 0.27 United Express/Shuttle America 1 0.04 5 0.13 United Express/Trans States 14 0.30 2 0.36 UPS 31 0.17 30 0.21 Yangtze River Express Airlines 5 0.15 2 0.48 Overall 732 0.39 741 0.31 Green represents a deviation of less than 0.5 nautical miles

Orange represents a deviation between 0.5 and 1.0 nautical miles

Red represents a deviation greater than 1.0 nautical mile

Chicago Department of Aviation Page 8 4th Quarter 2016 Nighttime Flight Track Report Chicago O'Hare International Airport Period: 4th Quarter 2016 Time of Day: 11:00 p.m. to 6:00 a.m.

Preferential Flight Existing Runways Existing Runways Future Runways Track to be Decommissioned Runway Departures (in %) versus Deviation (in nautical miles)

Deviation 4L 4R 9L 9R 10C 10L 10R 15 22L 22R 27L 27R 28C 28L 28R 33

< 0.5 n/a n/a n/a 60% n/a 87% n/a 86% 43% n/a 76% n/a n/a n/a 88% 80%

0.5 < 1.0 n/a n/a n/a 21% n/a 4% n/a 11% 51% n/a 18% n/a n/a n/a 8% 17%

>1.0 n/a n/a n/a 19% n/a 9% n/a 3% 6% n/a 6% n/a n/a n/a 4% 3% n/a = not applicable Flight tracks shown until 3,000' Mean Sea Level (MSL)

Chicago Department of Aviation Page 9 4th Quarter 2016 Nighttime Noise Complaint Report Chicago O'Hare International Airport Period: 4th Quarter 2016 Time of Day: 10:00 p.m. to 7:00 a.m.

Complaints by Community1 Nature of Noise Complaints

Total Number of Community Complaints Complainants

Addison 28 3 Arlington Heights 2,317 14 Barrington 24 2 Bartlett 220 6 Not Reported Bensenville 23,189 10,459 0% Berkeley 15 11 Bloomingdale 713 64 Brookfield 72 Low Flying 23% Buffalo Grove 11Aircraft Noise Carol Stream 3156% Chicago 64,902 18,936 Ward 38 2,884 43 Ward 39 5,374 90 Ward 40 2,263 18 Ward 41 22,485 866 Ward 45 4,967 70 Ward Other 9,124 58 Ward Unknown 17,805 17,791 Frequency of Clarendon Hills 11 Operations 17% Deer Park 11 Vibration Des Plaines 341 17 4% Downers Grove 22 Elgin 1,808 1,733 Elk Grove Village 10,123 4,183 Elmhurst 1,104 48 Elmwood Park 43 Evanston 723 241 Frankfort 11 Franklin Park 53 18 Geneva 1,912 1,903 Gilberts 15 1 Glen Ellyn 42 Glenview 1,792 52 Golf 21 1 Hampshire 61 Hanover Park 21 Harwood Heights 421 7 Highland Park 21 Hillside 91 Hoffman Estates 24 2 Itasca 3,198 18 Kildeer 15 15 La Grange Park 33 3 Lake Barrington 11 Leland 22 Lincolnwood 875 506 Lombard 41 Medinah 1,058 162 Melrose Park 64 1 Morton Grove 21 Mount Prospect 1,410 5 Niles 2,722 14 Norridge 2,769 40 Northbrook 11 3 Northfield 21 Northlake 11 Oak Park 11 3 Palatine 106 29 Park Ridge 11,376 373 Prospect Heights 22 River Forest 1,983 1,983 River Grove 41 Riverside 32 Rolling Meadows 63 Roselle 532 9 Rosemont 151 2 Schaumburg 1,958 965 Schiller Park 1,267 18 Skokie 45 2 Sleepy Hollow 133 1 South Barrington 71 Sugar Grove 11 Unincorporated Cook 2,657 2 Villa Park 44 Wayne 608 3 West Chicago 136 2 West Dundee 11 Western Springs 72 Wheaton 78 5 Wilmette 11 Winnettka 44 44 Wood Dale 21,130 799 Community Unknown 25 25

4Q 2016 Total 164,231 42,776 3Q 2016 Total 230,634 35,280 12 Month Average2 219,961 37,614 1 Only includes calls made from the State of Illinois. 2 12 Month Average equals average of: 1Q 2016, 2Q 2016, 3Q 2016 and 4Q 2016.

Chicago Department of Aviation Page 10 4th Quarter 2016 Airline Ground Run-Up Report Chicago O'Hare International Airport Period: 4th Quarter 2016 Time of Day: 24 Hours

All Airlines 4th Quarter 2016 3rd Quarter 2016 12 Month Avg. 1 Location Run-ups Percentage Run-ups Percentage Run-ups Percentage GRE 163 79% 148 77% 152 78% Other 44 21% 45 23% 43 22% Total 207 100% 193 100% 194 100% GRE 75 79% 77 81% 78 81% Other 20 21% 18 19% 18 19% Total 95 100% 95 100% 96 100% GRE 24 96% 13 100% 20 99% Other 14% 00% 01% Total 25 100% 13 100% 20 100% GRE 50 94% 31 100% 38 97% Other 36% 00% 13% Total 53 100% 31 100% 39 100% GRE 9 38% 24 51% 16 43% Other 15 63% 23 49% 21 57% Total 24 100% 47 100% 37 100% GRE 5 50% 3 43% 9 67% Other Other 5 50% 4 57% 4 33% Total 10 100% 7 100% 13 100%

Ground Run-Up Locations 4Q 2016

Other 21%

GRE 79%

112 Month Average equals the average of: 1Q 2016, 2Q 2016, 3Q 2016 and 4Q 2016.

Chicago Department of Aviation Page 11 4th Quarter 2016 Aircraft Ground Run-Up Report Chicago O'Hare International Airport Period: 4th Quarter 2016 Time of Day: 24 Hours

4th Quarter 2016 3rd Quarter 2016

Run-ups Run-ups Percentage Run-ups Run-ups Percentage Aircraft Total in GRE Use of GRE Total in GRE Use of GRE

A319 3 3 100% 33100%

A320 5 4 80% 11 9 82%

B737 52 46 88% 61 59 97%

B747 0 0 0% 400%

B757 11 3 27% 10 4 40%

B767 17 2 12% 17 1 6%

B777 5 0 0% 12 0 0%

DC9Q 0 0 0% 000%

E135/145 35 34 97% 23 23 100%

MD80 28 28 100% 26 26 100%

Regional Jet (unspecified type) 45 42 93% 23 23 100%

Other 6 1 17% 300%

TOTAL 207 163 79% 193 148 77%

Chicago Department of Aviation Page 12 4th Quarter 2016 Chicago Department of Aviation Page 13 4th Quarter 2016 Nighttime Aircraft Noise Report Chicago O'Hare International Airport Period: 4th Quarter 2016 Time of Day: 10:00 p.m. to 7:00 a.m. Metric: Aircraft Leq

1 RMT Last 4 Quarters Monitored Noise Levels Community 4Q 2015 12 Month Avg. # 1Q 2016 2Q 2016 3Q 2016 4Q 2016

1 Arlington Heights 48.4 49.4 49.1 48.1 49.2 48.8 2 Melrose Park 44.3 47.8 49.8 48.7 50.1 48.1 3 Bensenville 54.1 54.1 54.8 56.4 54.2 54.9 4 Schiller Park 47.5 48.4 50.0 50.7 48.5 49.3 5 Chicago 51.9 52.8 51.6 51.5 51.7 52.0 7 Des Plaines 40.5 39.8 42.3 39.3 42.2 40.6 8 Des Plaines 43.0 43.3 46.8 46.4 44.8 45.2 10 Rolling Meadows 43.9 47.9 49.8 50.5 44.2 48.7 11 Chicago 44.3 46.6 45.5 45.0 44.4 45.4 12 Elk Grove Village 53.0 55.3 52.4 51.8 52.1 53.3 13 Elk Grove Village 59.4 60.8 61.5 59.0 61.1 60.3 14 Elk Grove Village 53.2 52.7 51.4 52.0 54.5 52.4 15 Franklin Park 39.7 40.9 45.3 45.3 41.5 43.5 16 Franklin Park 53.9 52.3 54.0 56.5 56.0 54.4 17 Harwood Heights 58.4 56.7 56.8 57.1 59.6 57.3 19 Stone Park 39.6 40.1 41.2 41.3 42.1 40.6 20 Mount Prospect 48.1 47.3 46.6 45.1 47.9 46.9 21 Mount Prospect 45.5 42.9 40.4 42.6 43.5 43.2 22 Norridge 59.4 59.5 59.1 57.6 60.8 59.0 23 Northlake 54.2 53.6 54.7 55.1 55.4 54.4 24 Park Ridge 41.5 43.5 46.8 43.2 43.2 44.2 25 Park Ridge 53.3 55.3 53.9 53.2 52.5 54.0 26 Park Ridge 44.2 47.3 46.2 44.9 46.5 45.8 27 Rosemont 59.9 62.4 61.1 60.8 59.7 61.1 28 Schiller Park 64.1 66.4 66.7 66.8 66.6 66.1 29 Wood Dale 57.8 60.5 59.1 58.3 58.4 59.1 30 Wood Dale 43.6 43.4 48.8 46.8 44.0 46.3 32 Wood Dale 58.6 58.6 57.7 57.8 58.6 58.2 33 Park Ridge 47.6 50.7 50.3 49.9 51.1 49.8 34 Elk Grove Village 50.3 55.8 50.8 50.5 50.7 52.6 35 Unincorporated Cook 47.6 46.9 47.4 49.1 50.1 47.8 37 Mount Prospect 39.4 38.3 39.7 38.2 38.1 39.0 42 Chicago 44.9 47.8 47.2 46.1 46.9 46.6 1 Leq (Equivalent Sound Level): The average sound energy level during a stated period of time. Red represents an increase of 1 dB or more from same quarter of the previous year (7 monitors). Green represents a decrease of 1 dB or more from same quarter of the previous year (11 monitors).

Chicago Department of Aviation Page 14 4th Quarter 2016

Chicago Department of Aviation O’Hare Noise Hotline: 1-800-435-9569 www.flychicago.com/ORDNoise