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| Cambridge Air Quality Boston & Suffolk/Middlesex Counties | |||||
| . | Good Days | Moderate Days | Unhealthy for Sensitive Persons Days | Unhealthy Days | Very Unhealthy Days | 
| 2017 | 178 | 182 | 5 | 0 | 0 | 
| 2016 | 218 | 141 | 7 | 0 | 0 | 
| 2015 | 212 | 149 | 3 | 1 | 0 | 
| 2014 | 212 | 153 | 0 | 0 | 0 | 
| 2013 | 224 | 136 | 5 | 0 | 0 | 
| Cambridge Water Quality | |||
| . | % Good | % Threatened | % Impaired | 
| 2014 | 14 | 0 | 86 | 
| 2012 | 4 | 0 | 96 | 
| 2010 | 5 | 0 | 95 | 
| 2008 | na | na | na | 
| 2006 | na | na | na | 
| 2004 | 14 | 0 | 86 | 
| 2002 | 20 | 0 | 80 | 
| Cambridge Recreation | ||
| . | # of Parks | # of Parks (99 City Avg) | 
| National Parks, Historic Sites, etc. (managed by National Park Service) | Cape Cod National Seashore, John F. Kennedy National Historic Site plus 20 more | 7 | 
| National Campgrounds, Lodges, etc. (other federal agency-managed sites) | 8 | 26 | 
| State Parks, Sites, etc. | 44 | 11 | 
| Cambridge Climate 1971-2000 | ||
| . | . | 99 City Avg | January - Avg Low Temp | 22 F | 27 F | 
| January - Avg Daily Temp | 29 F | 37 F | 
| July - Avg Daily Temp | 74 F | 74 F | 
| July - Avg High Temp | 82 F | 86 F | 
| Avg Annual Precipitation | 43 in | 35 in | 
| Cambridge Elevation | |
| 20 feet | GPTR 99 City Average 1,652 feet | 
| Cambridge Natural Hazards | ||
| . | Risk Level | 99 City Average | 
| Total Hazard Risk | Moderate | Moderate | 
| Earthquake | .6% | 10.9% | 
| Tsunami | No Risk | No Risk | 
| Hurricane | 20-40 | 10 | 
| Flood | Very High | Very High | 
| Tornado | Low | Low | 
| Volcano | No Risk | No Risk | 
| Wildfire | Low | Low | 
| Cambridge Man-Made Hazards (Nuclear) | ||
| Nuclear Power Stations (# Reactors) | Distance from City | GPTR 99 City Average | 
| Pilgrim (1) | 30 miles | 50% of cities are within 100 miles of at least one nuclear station | 
| Seabrook (1) | 40 miles | |
| Cambridge Heating and Cooling Degree Days (avg annual) | ||
| . | . | 99 City Avg | 
| Total Degree Days | 6,407 | 5,915 | 
| HDD | 5,630 | 4,662 | 
| CDD | 777 | 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)
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