The practices of good occupational hygiene encompass four fundamental elements: anticipation, recognition, evaluation, and control. 

• Anticipation: Anticipation involves the proactive identification of potential hazards in the workplace, leveraging principles from chemistry, physics, engineering, and toxicology to foresee possible risks before they manifest. 
• Recognition: Recognition focuses on detecting and identifying existing hazards, utilizing knowledge from chemistry, physics, and epidemiology to understand their nature and the potential adverse effects they may have on worker health.
• Evaluation: Evaluation is the process of quantifying exposure to these environmental hazards and interpreting the measurements to assess the level of risk present. This step is crucial for understanding the extent of worker exposure and informing the necessary interventions. 
• Control: Control is the fourth important component, where strategies are developed and implemented to eliminate, reduce, or manage hazardous conditions. These strategies can include educational initiatives, design modifications, and other effective interventions aimed at improving workplace health and safety.

The main objectives and reasons for controlling hazardous substances are:

- To protect the health of workers from exposure to substances.

- To ensure the comfort of workers.

- To adhere to exposure standards.

The prevention of occupational hygiene primarily aims to protect the health of workers by controlling their exposure to hazardous substances. This includes implementing measures to ensure workers' comfort and well-being, as well as adhering to established exposure standards. By effectively managing and mitigating exposure to harmful agents, occupational hygiene practices help create a safer and more comfortable working environment, ultimately safeguarding workers' health and ensuring compliance with regulatory standards.

1. Air Monitoring: Evaluating the quality of ambient air and detecting pollutants.
2. Asbestos and Hazardous Materials: Identification and management of asbestos and other hazardous substances.
3. Chemical Substance Analysis: Monitoring and analysis of chemical agents in environments.
4. Exposure Assessment: Evaluation of individual or population exposure to environmental hazards.
5. Heat: Assessment of heat levels and their impact on environments and health.
6. Mould Assessment: Identification and evaluation of mould growth and its health implications.
7. Airborne Contaminants: Monitoring of particles and pollutants suspended in air.
8. Bacteria Assessments: Analysis of bacterial presence and activity in various environments.
9. Chemical Exposure Assessments:Detailed evaluation of potential health risks from chemical exposures.
10. Clandestine Drug Laboratory Evaluation: Identification and mitigation of hazards in illegal drug production sites.
11. Lighting: Assessment of lighting conditions and their adequacy for safety and health.
12. Ventilation: Evaluation of air flow systems to ensure appropriate air quality and comfort.
13. Welding Fume Assessments: Analysis of air quality concerning particulate matter from welding operations.
14. Workplace Noise: Measurement and assessment of noise levels to address potential hearing damage and disturbance.

These categories cover a broad range of environmental and occupational health assessments critical for ensuring safety and compliance with health regulations.