Acceptable air quality

Acceptable air quality When workspace air has no known harmful contaminants present which may influence the immediate or future health of the occupants. 

Tier I The focal point of Tier I is the waste feed. This tier limits the hourly feed rate of individual metals into the combustion device. These limits have been developed by U.S. EPA and can be found in Part 266, Appendix I.5 U.S. EPA established these feed rate limits by considering flue gas flows, stack height, terrain, and land use in the vicinity of the facility. It determined acceptable air quality levels for each type of metal as a function of terrain, stack height, and land use in the vicinity of the facility. This value is also the waste feed rate, as Tier I assumes that 100% of the metals that are fed into the unit will be released into the atmosphere. 

Calvert, J. G., J. B. Heywood, R. F. Sawyer, and J. H. Seinfeld, Achieving Acceptable Air Quality Some Reflections on Controlling Vehicle Emissions, Science, 261, 37-45 (1993). 

Acceptable limits of water, land, and air pollution could be achieved if costs were not considered. However, economics is a part of life and in many areas pollution has advanced to the extent that tens of billions of dollars are needed to catch up with the problem, and as the population of the United States increases and more demands are placed on our resources, more sophisticated techniques will be required to reach acceptable air quality levels. Whatever the outcome of these computations are, any implementation plan will meet with almost insurmountable obstacles. This is true for meeting the California standards plan but even more so for the federal ones. 

WHO guidelines and accepted air quality standards even though forest fires were actively burning in tbe vicinity (2-5 km) of tbe sampling sites. 

ASHRAE 62, Ventilation for Acceptable Air Quality This standard can assist professionals in the proper design of building ventilation systems. Important aspects of the standard include the definition of acceptable air quality and information about ventilation effectiveness. It makes a recommendation about using source control through isolation and local exhaust. The standard also contains information on the use of heat recovery ventilation and provides a guideline for allowable carbon dioxide levels. 

Fit testing requirements and procedures Inspection, cleaning, maintenance, and storage procedures Provision for medical examinations Process for work area surveillance Acceptable air quality standards Use of approved respirators... 

California Energy Commission, Methanol as a MotorEuel Review of the Issues Related to Air Quality, Demand, Supply, Cost, Consumer Acceptance and Health and Safety, Pub. P500-89-002, Sacramento, Calif., April 1989. 

Quality assurance programs are designed to serve two functions (1) assessment of collected air quality data and (2) improvement of the data collection process. These two functions form a loop as air quality data are collected, procedures are implemented to determine whether the data are of acceptable precision and accuracy. If they are not, increased quality control procedures are implemented to improve the data collection process. 

Modeling a single parcel of air as it is being moved along allows the chemical reactions in the parcel to be modeled. A further advantage of trajectory models is that only one trajectory is required to estimate the concentration at a given endpoint. This minimizes calculation because concentrations at only a limited number of points are required, such as at stations where air quality is routinely monitored. Since wind speed and direction at the top and the bottom of the column are different, the column is skewed from the vertical. However, for computational purposes, the column is usually assumed to remain vertical and to be moved at the wind speed and direction near the surface. This is acceptable for urban application in the daytime, when winds are relatively uniform throughout the lower atmosphere. 

Ventilation for Acceptable Indoor Air Quality." American Society of Heating, Refrigerating and Air-Conditioning Engineers, Atlanta, 1981. 

The particles most likely to cause adverse health effects are the fine particulates, in particular, particles smaller than 10 p and 2.5 mm in aerodynamic diameter, respectively. They are sampled using (a) a high-volume sampler with a size-selective inlet using a quartz filter or (b) a dichotomous sampler that operates at a slower flow rate, separating on a Teflon filter particles smaller than 2.5 mm and sizes between 2.5 mm and 10 mm. No generally accepted conversion method exists between TSP and PM,o, which may constitute between 40% and 70% of TSP. In 1987, the USEPA switched its air quality standards from TSP to PMk,. PM,q standards have also been adopted in, for example, Brazil, Japan, and the Philippines. In light of the emerging evidence on the health impacts of fine particulates, the USEPA has proposed that U.S. ambient standards for airborne particulates be defined in terms of fine particulate matter. 

The main purpose for the heating and air conditioning of work spaces is to provide an environment that is acceptable and does not impair the health and performance of the occupants. During production processes and in the external environment it may be necessary to work in unacceptable conditions for a limited time period. However, it must be ensured that these conditions do not impair the health of the employees. Light, noise, air quality, and the thermal environment are all factors that influence the acceptability of conditions for and performance of the occupants. This section will only deal with the thermal environment. Several standards dealing with methods for the evaluation of the thermal environment have been published by international standard organizations such as ISO and CEN. 

Requirements for indoor environment quality must be discussed and decided before the air conditioning design is performed. Criteria for acceptable indoor air quality and thermal comfort must be set. 

Conditioning Engineers. (1989) Standard 62-19S9, Ventilation for Acceptable Indoor Air Quality. Atlanta Author. 

Table 3 shows the current health-related national ambient air quality standards set by the EPA as of 1999. Regions that violate these standards may be classified as nonattamment areas by the EPA, and can face sanctions if they do not promulgate pollution control plans that are acceptable to the agency. 

Acceptable indoor air quality (lAQ) is defined as air in which there are no known contaminants at harmful concentrations as determined by cognizant authorities and with which a substantial majority (80%) of the people exposed do not express dissatisfaction (ASHRAE, 1989). Some of these indoor air contaminants are particulates, vapors, and gases that may be generated by occupants and their activities, building materials, furniture, equipment and appliances present in indoor space, operations and main-... 

To maintain acceptable indoor air quality, the concentration of pollutants known to degrade indoor air quality and affect human health must be controlled. If the origin of the contaminant is known, it is more effective to exercise source control over any mitigation strategy. If the origin of the contaminants is not known, building ventilation and air cleaning and filtration are the two most commonly used processes to dilute or remove all types of contaminants from the indoor air and maintain acceptable indoor environmental conditions. 

Extrapolating exposure estimates to all urban cities In the world would Indicate that as many as 625 million people, mostly In developing countries, are exposed to unacceptable levels of 02 pollution and about 1.25 billion people live In urban areas where SPN levels exceed acceptable guidelines. This means that less than 20 percent of city dwellers live In environments that can be considered to have acceptable outdoor air quality levels. 

The UN wanted me to go to West Africa again for six months to organize elections in Guine-Bissau and I thought things would be better when I returned. I still believed the agency intended to improve the air quality. So I accepted a new contract and sold my flat in London. 

NATICH. 1994. National Air Toxics Information Clearinghouse Data base report on acceptable ambient air concentration guidelines/standards concentrations, units, and averaging times report. US Environmental Protection Agency, Office of Air Quality Planning and Standards. Washington, DC. 

WA Air Qual. Program. 1998. Toxic air pollutants and acceptable source impact levels. Washington Air Quality Program, Department of Ecology. Wash Admin Code Section 173-460. 

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