Which type of environment hazard is classified as BSL1?

The classification of Biological Safety Levels (BSL) helps establish the appropriate level of precautions necessary when working with various microorganisms in laboratory settings. BSL1 refers to laboratories that handle non-pathogenic microorganisms. These are organisms that are generally understood to pose minimal risk to laboratory personnel and the environment. They typically do not cause disease in healthy individuals and are used in basic microbiological teaching or research.

Non-pathogenic microorganisms, which include certain strains of E. coli and Bacillus subtilis, are used safely in research and often serve as models for studying more complex biological processes without the risk associated with pathogenic strains. Thus, they can be manipulated in a standard laboratory environment without the need for extensive safety measures.

Other options, such as severe illness-causing microorganisms, would require high containment measures under BSL2 or higher due to the potential health risks they present. Radioactive materials and hazardous chemical agents also necessitate distinct safety protocols but do not fall under biological safety levels; rather, their handling adheres to regulations for chemical safety and radiation safety protocols.