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| Naperville Air Quality Du Page County |
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| . | Good Days | Moderate Days | Unhealthy for Sensitive Persons Days | Unhealthy Days | Very Unhealthy Days |
| 2017 | 237 | 72 | 2 | 0 | 0 |
| 2016 | 194 | 38 | 9 | 0 | 0 |
| 2015 | 219 | 40 | 1 | 0 | 0 |
| 2014 | 205 | 29 | 0 | 0 | 0 |
| 2013 | 231 | 71 | 0 | 0 | 0 |
| Naperville Water Quality Des Plaines & Lower Fox Watersheds |
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| . | % Good | % Threatened | % Impaired |
| 2014 | na | na | na |
| 2012 | na | na | na |
| 2010 | na | na | na |
| 2008 | 18 | 0 | 82 |
| 2006 | 22 | 0 | 78 |
| 2004 | 24 | 0 | 76 |
| 2002 | 28 | 0 | 72 |
| Naperville Recreation |
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| . | # of Parks | # of Parks (99 City Avg) |
| National Parks, Historic Sites, etc. (managed by National Park Service) |
Indiana Dunes National Lakeshore and Pullman National Monument | 7 |
| National Campgrounds, Lodges, etc. (other federal agency-managed sites) |
2 | 26 |
| State Parks, Sites, etc. | 11 | 11 |
| Naperville Climate (1971-2000) |
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| . | . | 99 City Avg | January - Avg Low Temp | 14 F | 27 F |
| January - Avg Daily Temp | 23 F | 37 F |
| July - Avg Daily Temp | 75 F | 74 F |
| July - Avg High Temp | 87 F | 86 F |
| Avg Annual Precipitation | 38 in | 35 in |
| Naperville Elevation | |
| 680 feet | GPTR 99 City Average 1,652 feet |
| Naperville Natural Hazards |
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| . | Risk Level | 99 City Average |
| Total Hazard Risk | Lower | Moderate |
| Earthquake | .5% | 10.9% |
| Tsunami | No Risk | No Risk |
| Hurricane | 0 | 10 |
| Flood | Very High | Very High |
| Tornado | Moderate | Low |
| Volcano | No Risk | No Risk |
| Wildfire | Low | Low |
| Naperville Man-Made Hazards (Nuclear) |
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| Nuclear Power Stations (# Reactors) |
Distance from City | GPTR 99 City Average |
| Braidwood (2) | 35 miles | 50% of cities are within 100 miles of at least one nuclear station |
| Dresden (2) | 40 miles | |
| LaSalle (2) | 55 miles | |
| Byron (2) | 60 miles | |
| D.C. Cook (2) | 95 miles | |
| Palisades (1) | 100 miles | |
| Naperville Heating and Cooling Degree Days (avg annual) |
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| . | . | 99 City Avg |
| Total Degree Days | 6,995 | 5,915 |
| HDD | 6,053 | 4,662 |
| CDD | 942 | 1,253 |
Legend: Small green circles (older style maps) or multi-colored circles (newer style maps: click here for legend) indicate 1)Superfund Sites 2)Federal Facilities 3)RCRA Corrective Action Sites and 4)Brownfields Properties (EPA hazardous material cleanup sites defined at Environment link)
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| Burlington has Similar Geography & Climate | Concord has Similar Geography & Climate | Marietta has Similar Geography & Climate | Video Tours for Illinois Retirement Cities |
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