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and I edited the sixth edition of Patty's Industrial Hygiene with the permission of Robert Harris.

      It is now my privilege and honor to follow them and Frank A. Patty as the editor of the seventh edition of the Industrial Hygiene volumes of Patty's Industrial Hygiene and Toxicology. Each of the four volumes and the chapters in the seventh edition are a “stand alone.” Volume 1 covers Chemical Hazard Recognition, Volume 2 addresses Evaluation and Control of Chemical Hazards, Volume 3 considers aspects of Physical and Biological Agents, and Volume 4 considers Management and Specialty Areas of Practice. In addition, Volume 4 contains a complete index covering all four volumes.

Industrial hygiene has been dealt with very broadly in the past editions of Patty's Industrial Hygiene and Toxicology. Chapters have been offered on sampling and analysis, exposure measurement and interpretation, absorption and elimination of toxic materials, instrument calibration, industrial noise, ionizing and nonionizing radiation, heat and cold stress, pressure, lighting, control of exposures, ergonomics, hazardous wastes, and other vital areas of practice. These traditional areas continue to be covered in this edition. Consistent with the past history of Patty's, new areas of industrial hygiene concerns and practices have been addressed: robotics, sensors, social media, nanomaterials, infectious diseases, dermal effects of chemical exposures, mathematical modeling, control banding, product stewardship, construction health and safety issues, cannabis, new energy production, health care work settings, emergency and disaster response, sustainability, and fire safety.

      Although industrial hygiene has been practiced in one guise or another for centuries, the most systematic approaches and the most esoteric accomplishments have been made in the past 50 or 60 years – generally in the years since Frank Patty published his first book. This accelerated progress is due primarily to increased public awareness of occupational health and safety issues and need for environmental control as is evidenced by Occupational Safety and Health, Clean Air, and Clean Water legislation at both federal and state levels.

      Industrial hygienists know that variability is the key to the measurement and interpretation of workers' exposures. If exposures did not vary, exposure assessment could be limited to a single measurement, the results of which could be acted upon, and the matter filed away as something of no further concern. We know, however, that exposures change, and change is characteristic of the science and practice of our profession as well. We must be alert to recognize new hazards, we must continue to evaluate new and changing stresses, and we must evaluate performance of exposure controls and from time to time upgrade them. These volumes represent the theory and practice of industrial hygiene as they are understood by their chapter authors at the time of their writing. But, as observed by the Greek philosopher Heracleitus about 2500 years ago, “There is nothing permanent except change.” Improvements and changes in theory and practice of industrial hygiene take place continuously and are generally reported in the professional literature. Industrial hygienists, the practitioners, the teachers, and the managers must stay abreast of the professional literature. Furthermore, when an industrial hygienist develops new knowledge, he/she has what almost amounts to an ethical obligation to share it with others in the profession.

      One cannot ponder the rapid changes and advancements made in recent decades in science and technology, and in our own profession as well, without wondering at what the next two or three decades will bring. Developments in computer technology, information processing, and exchange and communications have greatly influenced workplaces and the general conduct of commerce and business in the past one or two decades. It has also changed the way we now practice the purposes of industrial hygiene. These changes have accelerated. The possibility for continuously monitoring and computer storage of exposures of individual workers is a reality. World population continues to increase geometrically and is expected to be about eight billion in the year 2025; with improvements in preventive health care, there will be an increasingly older population. Genetic engineering and highly effective pesticides are already improving yields of agricultural commodities; if all goes well in this area, feeding the expanding human population may not be a limiting factor. Globalization of manufacturing and commerce has reduced manufacturing employment in the United States and in Europe, and expanded opportunities for populations in some developing nations. The United States and other developed nations are on their way to becoming world centers of information and innovation.

      How will all of this affect the future practice of industrial hygiene? In the Preface to the fourth edition of Patty's, George and Florence Clayton suggested that the future of industrial hygiene is limited only by the narrowness of vision of its practitioners.

      I have relied extensively on the well‐written Preface by Robert Harris, Editor of the fifth edition of Patty's Industrial Hygiene. In it I saw a sweeping, but still succinct, review not only of Patty's publications but also of the practice of industrial hygiene itself. His writing is as timely in 2021 as it was 20 years ago.

      Occupational and environmental hygiene professionals must be aware of the changes likely to take place, and to develop strategies to assure the profession's full participation in protecting the health and safety of workers and the environment of both today and tomorrow. Our participation, locally, nationally, and globally, will continue to be greatly needed in the coming years.

      Barbara Cohrssen

      San Francisco, California

USEFUL EQUIVALENTS AND CONVERSION FACTORS

      1 kilometer = 0.6214 mile

      1 meter = 3.281 feet

      1 centimeter = 0.3937 inch

      1 micrometer = 1/25,4000 inch = 40 micro inches = 10,000 Angstrom units

      1 foot = 30.48 centimeters

      1 inch = 25.40 millimeters

      1 square kilometer = 0.3861 square mile (U.S.)

      1 square foot = 0.0929 square meter

      1 square inch = 6.452 square centimeters

      1 square mile (U.S.) = 2,589,998 square meters = 640 acres

      1 acre = 43,560 square feet = 4047 square meters

      1 cubic meter = 35.315 cubic feet

      1 cubic centimeter = 0.0610 cubic inch

      1 cubic foot = 28.32 liters = 0.0283 cubic meter = 7.481 gallons (U.S.)

      1 cubic inch = 16.39 cubic centimeters

      1 U.S. gallon = 3,7853 liters = 231 cubic inches = 0.13368 cubic foot

      1 liter = 0.9081 quart (dry), 1.057 quarts (U.S., liquid)

      1 cubic foot of water = 62.43 pounds (4°C)

      1 U.S. gallon of water = 8.345 pounds (4°C)

      1 kilogram = 2.205 pounds

      1 gram = 15.43 grains

      1 pound = 453.59 grams

      1 ounce (avoir.) = 28.35 grams

      1 gram mole of a perfect gas 24.45 liters (at 25°C and 760 mm Hg barometric pressure)

      1 atmosphere = 14.7 pounds per square inch

      1 foot of water pressure = 0.4335 pound per square inch

      1 inch of mercury pressure = 0.4912 pound per square inch

      1 dyne per square centimeter = 0.0021 pound per square foot

      1 gram‐calorie = 0.00397 Btu

      1 Btu = 778 foot‐pounds

      1 Btu per minute = 12.96 foot‐pounds per second

      1 hp = 0.707 Btu per second = 550 foot‐pounds per second

      1 centimeter per second = 1.97 feet per minute = 0.0224 mile per hour

      1 footcandle = 1 lumen incident per square foot = 10.764 lumens incident per square meter

      1 grain per cubic foot = 2.29 grams per cubic meter

      1 milligram per cubic meter

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