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2nd Quarter 2016 Report

Fly Quiet Program Chicago O’Hare International Airport

Visit the O’Hare Noise Webpage on the Internet at www.flychicago.com/ORDNoise 2nd Quarter 2016 Report

Background

On June 17, 1997, the City of Chicago announced that 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 2Q 2016 include:

Departures Arrivals Most used nighttime departure runway: 28R – 28% Most used nighttime arrival runway: 27L – 31% 9R night departures increased by 12pp from 1Q 2016 10C night arrivals increased by 12pp from 1Q 2016 28R night departures decreased by 10pp from 1Q 2016 28C night arrivals decreased by 7pp from 1Q 2016 pp = Percentage Points Nighttime operations represent 11% of the overall daily operations

Arrival Summary

A summary of nighttime arrivals is provided for the two most-used arrival runways (10C and 27L); the 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 2nd 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 (28R and 9R); 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 Illinois 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 . 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 2nd Quarter 2016 Runway Use Report Chicago O'Hare International Airport Period: 2nd 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 14L 14R 22L 22R 27L 27R 28L 28C 28R 32L 32R Average Daily Departures 2Q 2016 0 0 0 29 16 2 0 n/a 0 11 0 0 0 0 3 33 24 n/a 1Q 2016 0 0 0 13 7 1 0 n/a 0 14 0 1 0 0 2 39 28 n/a 12 Month Avg. 0 0 0 14 9 1 0 0 0 18 0 0 0 0 3 35 30 1 Average Daily Arrivals 2Q 2016 0 0 11 5 16 36 1 n/a 2 0 0 46 3 0 24 6 n/a n/a 1Q 2016 0 1 5 2 10 16 0 n/a 1 0 0 48 2 0 30 12 n/a n/a 12 Month Avg. 0 0 7 3 11 22 0 0 2 0 0 43 5 0 37 14 n/a 0

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 2Q 2016 2Q 2016 0 0 0 0

0 0 7 2

20 1

0 24 3 31

0 0 28 14 11 4

2 2 24 16 0 0 0 0 1 0

0 0 10 0 0

Purple denotes Fly Quiet preferential departure and arrival runways. Runway 10R-28L was commissioned on October 15, 2015.

Chicago Department of Aviation Page 3 2nd Quarter 2016 Nighttime Hourly Operations Report Chicago O'Hare International Airport Period: 2nd Quarter 2016 Time of Day: 10:00 p.m. to 7:00 a.m.

Average Departures by Hour

70

60 48 50 41 34 40 29

30 Average Departures Average

20 14 13 9 8

10 6 5 3 3 3 3 2 1 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

2Q16 1Q16 12 Month Average*

Operations by Hour (%) 2Q 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 40.6% 11.7% 4.5% 2.6% 2.5% 1.4% 0.6% 7.5% 28.6% 100% Arrivals 14.0% 11.8% 5.5% 1.7% 1.0% 1.4% 8.7% 16.6% 39.2% 100%

Average Arrivals by Hour

70 59

60 50

50

40

25 Average Arrivals Average 30 21 18 21 18 16 20 13 8 11 6 10 3 2 1 1 2 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

2Q16 1Q16 12 Month Average*

* 12 Month Average equals the average of 3Q 2015, 4Q 2015, 1Q 2016 and 2Q 2016.

Chicago Department of Aviation Page 4 2nd Quarter 2016 Nighttime Arrival Summary Chicago O'Hare International Airport Period: 2nd Quarter 2016 Time of Day: 11:00 p.m. to 6:00 a.m.

2nd Quarter 2016 2nd Quarter 2015 Runway 27L Arrivals Arrivals Arrivals Airline Aer Lingus 1 -- AeroMexico 56 89 AeroUnion 1 -- Air Canada 3 -- Air China Cargo 1 2 1 -- 1 -- 34 44 1 5 387 459 7 1 6 -- Cargojet Airways 1 -- 1 -- 26 43 47 20 3 1 1 -- 241 109 FedEx 4 7 1 -- 61 114 JetBlue Airways 17 5 1 -- Netjets 6 1 PSA Airlines 3 -- 29 100 Sky West Aviation 87 169 160 145 Swift Air 4 5 Swiss International Airlines 1 -- TNT Airways 1 3 688 750 /ASA 71 135 United Express/Gojet 28 35 United Express/ 15 47 United Express/Trans States 14 27 UPS 18 20 26 9 1 -- WestJet Airlines 1 -- XOJet 2 1 Xtra Airways 1 -- Total 2,059 2,346

Chicago Department of Aviation Page 5 2nd Quarter 2016 Nighttime Arrival Summary Chicago O'Hare International Airport Period: 2nd Quarter 2016 Time of Day: 11:00 p.m. to 6:00 a.m.

2nd Quarter 2016 2nd Quarter 2015 Runway 10C Arrivals Arrivals Arrivals Airline AeroMexico 39 43 AeroUnion 1 1 Air Canada 1 -- Air China Cargo 11 17 AirBridge Cargo Airlines 1 -- Alaska Airlines 7 8 America West Airlines 16 25 American Airlines 291 220 Asiana Airlines 8 13 Atlas Air 14 1 Cargolux Airlines 10 10 Cathay Pacific Airways 2 7 1 1 China Cargo Airlines 2 4 Copa Airlines 16 20 Delta Air Lines 29 15 Delta Connection 3 3 Delta Private Jets 1 -- Emirates 7 7 Envoy Air 99 22 Etihad Airways 1 -- Eva Airways 1 -- FedEx 68 63 Frontier Airlines 32 38 JetBlue Airways 7 2 Lines 16 16 Lufthansa Cargo 8 9 Netjets 4 1 1 2 PSA Airlines 6 -- Airways 8 2 Qatar Airways 9 11 Republic Airlines 29 23 Sky West Aviation 39 46 Spirit Airlines 90 66 Swift Air 1 -- TNT Airways 1 7 United Airlines 370 282 United Express/ASA 26 29 United Express/Gojet 26 12 United Express/Shuttle America 23 13 United Express/Trans States 10 18 UPS 49 43 Virgin America 6 11 Yangtze River Express Airlines 2 2 Total 1,392 1,113

Chicago Department of Aviation Page 6 2nd Quarter 2016 Nighttime Preferential Flight Track Summary Chicago O'Hare International Airport Period: 2nd Quarter 2016 Time of Day: 11:00 p.m. to 6:00 a.m.

2nd Quarter 2016 2nd Quarter 2015 Runway 28R Departures Average Average Departures Deviation Departures Deviation Airline (nautical miles) (nautical miles) Aerologic 4 0.27 -- -- AeroMexico 49 0.34 48 0.24 AeroUnion 2 0.38 4 0.22 Air China Cargo 23 0.40 17 0.35 Air France 2 0.46 -- -- AirBridge Cargo Airlines 9 0.60 10 0.47 Alaska Airlines 1 0.01 2 0.24 America West Airlines 1 0.42 3 0.29 American Airlines 151 0.34 105 0.50 Asiana Airlines 40 0.36 9 0.24 Atlas Air 9 0.26 3 0.29 Cargolux Airlines 16 0.41 11 0.30 Cathay Pacific Airways 10 0.24 22 0.30 China Airlines 2 0.32 -- -- China Cargo Airlines 4 0.48 6 0.31 1 0.38 -- -- Delta Air Lines 8 0.22 15 0.30 Emirates 7 0.52 8 0.43 Envoy Air 5 0.27 46 0.77 FedEx 38 0.32 37 0.49 Frontier Airlines 3 0.26 4 0.77 JetBlue Airways 3 0.08 6 0.25 Korean Air Lines 24 0.26 23 0.18 LOT 1 0.77 1 0.16 Lufthansa 6 1.61 13 0.45 Lufthansa Cargo 4 0.35 1 0.47 Netjets 2 0.33 1 0.68 Nippon Cargo Airlines 15 0.29 25 0.47 Qantas Airways 11 0.37 -- -- Qatar Airways 12 0.49 -- -- Republic Airlines 8 0.24 32 0.65 Scandinavian Airlines 1 0.89 -- -- Sky West Aviation 24 0.33 70 0.45 Spirit Airlines 62 0.36 49 0.29 Turkish Airlines 1 0.28 5 0.31 United Air Lines 89 0.40 121 0.36 United Express/ASA 10 0.33 62 0.51 United Express/Gojet 5 0.39 33 0.33 United Express/Shuttle America 6 0.15 31 0.34 United Express/Trans States 5 0.19 13 0.40 UPS 14 0.19 14 0.46 Yangtze River Express Airlines 3 0.31 6 0.27 Overall 691 0.38 856 0.39 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 2nd Quarter 2016 Nighttime Preferential Flight Track Summary Chicago O'Hare International Airport Period: 2nd Quarter 2016 Time of Day: 11:00 p.m. to 6:00 a.m.

2nd Quarter 2016 2nd Quarter 2015 Runway 9R Departures Average Average Departures Deviation Departures Deviation Airline (nautical miles) (nautical miles) AeroMexico 5 0.28 4 0.03 Air Canada 1 1.38 -- -- American Airlines 35 0.08 18 0.19 Atlas Air 8 0.41 -- -- Delta Air Lines 5 0.29 26 0.11 Delta Connection/Compass 1 0.84 2 0.08 Envoy Air 22 0.68 8 0.72 Frontier Airlines 9 0.26 16 0.47 JetBlue Airways 6 0.47 -- -- Republic Airlines 5 0.08 2 0.40 Sky Regional Airlines 1 0.73 11 0.11 Sky West Aviation 24 0.61 2 0.47 Spirit Airlines 1 0.24 4 0.48 United Airlines 11 0.33 2 0.25 United Express/ASA 12 0.42 3 0.24 United Express/Gojet 11 1.10 1 0.46 United Express/Shuttle America 1 0.16 1 0.48 United Express/Trans States 2 0.38 5 0.49 UPS 2 0.30 72 0.21 WestJet Airlines 24 0.37 -- -- XOJet 4 0.17 -- -- Overall 190 0.46 177 0.32 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 2nd Quarter 2016 Nighttime Flight Track Report Chicago O'Hare International Airport Period: 2nd Quarter 2016 Time of Day: 11:00 p.m. to 6:00 a.m.

Preferential Flight Track Existing Runways Existing Runways Future Runways to be Decommissioned

Runway Departures (in %) versus Deviation (in nautical miles)

Deviation 4L 4R 9L 9R 10C 10L 10R 14R 22L 22R 27L 27R 28C 28L 28R

< 0.5 50% n/a n/a 77% n/a 75% n/a 80% 45% n/a 78% n/a n/a n/a 82%

0.5 < 1.0 50% n/a n/a 11% n/a 19% n/a 20% 46% n/a 20% n/a n/a n/a 15%

>1.0 0% n/a n/a 12% n/a 6% n/a 0% 9% n/a 2% n/a n/a n/a 3% n/a = not applicable There were departures in 2Q 2016 between 11:00 p.m. and 6:00 a.m on Runway 10C-28C which does not have a preferential flight track. Flight tracks shown until 3,000' Mean Sea Level (MSL)

Chicago Department of Aviation Page 9 2nd Quarter 2016 Nighttime Noise Complaint Report Chicago O'Hare International Airport Period: 2nd 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 47 5 Arlington Heights 2,930 13 Bartlett 30 8 Batavia 4 1 Not Reported Bensenville 101,774 39 Aircraft Noise 0% Berkeley 6 6 39% Bloomingdale 929 24 Carol Stream 34 3 Chicago 58,910 17,603 Ward 38 2,630 64 Ward 39 7,768 134 Ward 40 2,060 36 Low Flying Ward 41 13,314 884 41% Ward 45 6,188 94 Ward Other 10,606 69 Ward Unknown 16,344 16,322 Vibration Des Plaines 13 10 2% Elgin 1,462 6 Elk Grove Village 12,402 5,865 Elmhurst 131 5 Frequency of Elmwood Park 9 2 Operations Evanston 23 3 18% Forest Park 1 1 Franklin Park 135 5 Geneva 5 1 Glen Ellyn 368 5 Glenview 121 5 Hanover Park 7 1 Harwood Heights 138 6 Hillside 10 1 Hoffman Estates 16 12 Inverness 1 1 Itasca 5,675 36 Kildeer 8 8 La Grange Park 5 2 Lincolnwood 1,385 52 Medinah 1,013 92 Mount Prospect 387 4 Niles 1,073 4 Norridge 4,507 43 Northbrook 3 1 Oak Park 1 1 Palatine 69 9 Park Ridge 8,152 438 River Forest 1,251 1,251 River Grove 2 2 Rolling Meadows 1 1 Roselle 667 130 Schaumburg 6,709 4,390 Schiller Park 5,046 32 Skokie 77 1 Sleepy Hollow 3 1 St. Charles 149 6 Unincorporated Cook 1,801 1 Villa Park 3 2 Wayne 805 2 West Chicago 342 6 Westchester 4 1 Wheaton 458 6 Willmette 2 1 Winfield 1 1 Wood Dale 17,864 1,737 Community Unknown 677 677

2Q 2016 Total 237,646 32,569 1Q 2016 Total 247,332 39,830 12 Month Average2 249,989 35,626 1 Only includes calls made from the State of Illinois. 2 12 Month Average equals average of: 3Q 2015, 4Q 2015, 1Q 2016 and 2Q 2016.

Chicago Department of Aviation Page 10 2nd Quarter 2016 Airline Ground Run-Up Report Chicago O'Hare International Airport Period: 2nd Quarter 2016 Time of Day: 24 Hours

All Airlines 2nd Quarter 2016 1st Quarter 2016 12 Month Avg. 1 Location Run-ups Percentage Run-ups Percentage Run-ups Percentage GRE 163 77% 166 81% 140 72% Other 49 23% 39 19% 53 28% Total 212 100% 205 100% 193 100% GRE 77 88% 83 78% 80 80% Other 11 13% 23 22% 20 20% Total 88 100% 106 100% 100 100% GRE 21 100% 21 100% 19 100% Other 0 0% 0 0% 0 0% Total 21 100% 21 100% 19 100% GRE 39 100% 31 97% 27 99% Other 0 0% 1 3% 0 1% Total 39 100% 32 100% 28 100% GRE 15 31% 15 58% 14 37% Other 34 69% 11 42% 24 63% Total 49 100% 26 100% 39 100% GRE 11 73% 16 80% 10 82% Other Other 4 27% 4 20% 2 18% Total 15 100% 20 100% 12 100%

Ground Run-Up Locations 2Q 2016

Other 23%

GRE 77%

112 Month Average equals the average of: 3Q 2015, 4Q 2015, 1Q 2016 and 2Q 2016.

Chicago Department of Aviation Page 11 2nd Quarter 2016 Aircraft Ground Run-Up Report Chicago O'Hare International Airport Period: 2nd Quarter 2016 Time of Day: 24 Hours

2nd Quarter 2016 1st 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 0 0 0% 5 3 60%

A320 8 6 75% 5 5 100%

B737 47 44 94% 68 67 99%

B747 3 0 0% 10 2 20%

B757 20 3 15% 3 0 0%

B767 17 3 18% 21 1 5%

B777 7 1 14% 5 2 40%

DC9Q 0 0 0% 1 0 0%

E135/145 26 26 100% 33 33 100%

MD80 36 36 100% 21 21 100%

Regional Jet (unspecified type) 44 44 100% 33 32 97%

Other 4 0 0% 0 0 0%

TOTAL 212 163 77% 205 166 81%

Chicago Department of Aviation Page 12 2nd Quarter 2016 Chicago Department of Aviation Page 13 2nd Quarter 2016 Nighttime Aircraft Noise Report Chicago O'Hare International Airport Period: 2nd 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 2Q 2015 12 Month Avg. # 3Q 2015 4Q 2015 1Q 2016 2Q 2016

1 Arlington Heights 49.6 49.2 48.4 49.4 47.4 49.2 2 Melrose Park 48.1 50.1 44.3 47.8 46.9 48.0 3 Bensenville 53.9 54.2 54.1 54.1 55.8 54.0 4 Schiller Park -- 48.5 47.5 48.4 47.2 46.9 5 Chicago 51.1 51.7 51.9 52.8 53.3 51.9 7 Des Plaines 41.3 42.2 40.5 39.8 42.5 41.0 8 Des Plaines 45.8 44.8 43.0 43.3 49.6 44.4 10 Rolling Meadows 44.7 44.2 43.9 47.9 44.8 45.5 11 Chicago 42.9 44.4 44.3 46.6 45.9 44.8 12 Elk Grove Village 48.7 52.1 53.0 55.3 53.0 52.9 13 Elk Grove Village 61.4 61.1 59.4 60.8 58.0 60.7 14 Elk Grove Village 53.5 54.5 53.2 52.7 52.2 53.5 15 Franklin Park 38.2 41.5 39.7 40.9 42.3 40.3 16 Franklin Park 54.8 56.0 53.9 52.3 56.5 54.5 17 Harwood Heights 57.0 59.6 58.4 56.7 55.8 58.1 19 Stone Park 41.8 42.1 39.6 40.1 42.4 41.0 20 Mount Prospect 47.7 47.9 48.1 47.3 46.2 47.7 21 Mount Prospect 41.3 43.5 45.5 42.9 39.2 43.6 22 Norridge 58.4 60.8 59.4 59.5 -- 59.6 23 Northlake 57.2 55.4 54.2 53.6 56.0 55.3 24 Park Ridge 39.5 43.2 41.5 43.5 43.9 42.2 25 Park Ridge 50.6 52.5 53.3 55.3 54.4 53.2 26 Park Ridge 42.6 46.5 44.2 47.3 46.8 45.5 27 Rosemont 56.1 59.7 59.9 62.4 60.3 60.1 28 Schiller Park 64.9 66.6 64.1 66.4 66.4 65.6 29 Wood Dale 58.4 58.4 57.8 60.5 60.1 58.9 30 Wood Dale 44.4 44.0 43.6 43.4 44.1 43.9 32 Wood Dale 58.6 58.6 58.6 58.6 59.4 58.6 33 Park Ridge 50.6 51.1 47.6 50.7 51.8 50.2 34 Elk Grove Village 49.6 50.7 50.3 55.8 51.5 52.4 35 Unincorporated Cook 48.5 50.1 47.6 46.9 48.9 48.4 37 Mount Prospect 37.4 38.1 39.4 38.3 37.4 38.4 42 Chicago 45.5 46.9 44.9 47.8 -- n/a 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 (9 monitors). Green represents a decrease of 1 dB or more from same quarter of the previous year (9 monitors).

Chicago Department of Aviation Page 14 2nd Quarter 2016

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