Toxic Air Pollution
- Table showing summary information and detailed information on PM-10 concentrations reported at individual monitoring stations for Boston and nearby communities. From the Natural Resources Defense Council.
- http://www.nrdc.org/air/pollution/bt/1123.asp

Camnet: Blue Hill
- Real-time air pollution visibility camera network.
- http://www.hazecam.net/bluehill.html

Greater Boston Physicians for Social Responsibility
- Affiliate of the Physicians for Social Responsibility, focusing on the linkages between environmental exposures and health. Includes detailed information on current projects, report purchase forms, and membership information.
- http://psr.igc.org/

Zoo New England
- Franklin Park Zoo in Boston and Stone Zoo in Stoneham. General information, virtual tour, animal pictures, volunteer information, and conservation plans.
- http://www.zoonewengland.com/

AlongTheCharles.com
- Photos of wildlife and sights along with maps of the Charles River.
- http://alongthecharles.com/

Friends of Breakheart Reservation
- Volunteer organization dedicated to the preservation and improvement of Breakheart Reservation and Camp Nihan. Contains a list of activities, downloadable maps, and membership information.
- http://www.saugus.org/FOBR/

Acoustical Society of America - Greater Boston Chapter
- Includes meeting schedules and topics, along with membership information.
- http://www.gbcasa.org/

Friends of Boston Harbor Islands, Inc.
- Provides tours, trail maintenance, and advocacy for preservation of the Boston Harbor Islands. Includes information about the islands, an event calendar, a newsletter, and information about volunteering.
- http://www.fbhi.org/

Blue Hill Observatory
- The oldest continually-operated weather observatory in the U.S. Offers guided tours on weekends. Includes weather archives, a photo gallery, information for teachers, and current conditions.
- http://www.bluehill.org/