ACGIH 
An association of health and safety professionals devoted to protecting the health of the American worker and the environment. It supports the industrial hygiene profession in the anticipation, recognition, evaluation, and control of job-site hazards that may result in injury, illness, to workers.
American Industrial Hygiene Association
The AIHA is "..dedicated to the anticipation, recognition, evaluation, and control of environmental factors arising in or from the workplace that may result in injury, illness, impairment, or affect the well-being of workers and members of the community."
British Occupational Hygiene Society (BOHS)
"The aim of the Society is to promote the science of occupational hygiene by raising awareness of the value of the speciality through education, information exchange, research and professional networking."
Directory of Sites in Occupational and Environmental Health
Provides many 'home grown' academically derived educational resources (also available as FAQs) as well as vetted and updated 'links' relating to Occupational and Environmental Health and Medicine.
International Occupational Hygiene Association (IOHA)
Provides an international voice of the occupational hygiene profession through its recognition as a non-governmental organization (NGO) by the International Labour Organization and the World Health Organization. Conducts a wide range of activities intended to promote and develop occupational hygiene worldwide.
Technical Guide to Direct Reading Devices
Free online technical guide from the British Occupational Hygiene Society on DRDs used to monitor the atmosphere for airborne pollutants, which can be present as gases, vapours, aerosols or fume.
The Health and Safety Executive
Ensuring that risks to people's health and safety from work activities are properly controlled. Available resources, publications, and leaflets. (UK)
TOXNET
Provides access to a cluster of databases on toxicology, hazardous chemicals, and related areas. Instruction manuals are included.
Worksafe:Occupational Safety and Health Resources
A statewide coalition of individuals and organizations dedicated to promoting safety and health in the workplace in order to preserve the health of all Californians. The coalition includes labor and community groups as well as individual workers, occupational safety and health and other professionals, environmentalists, and other interested persons.
