Presents a new concept of describing the tolerance level of radon daughters. This concept is in terms of the alpha-energy dose resulting from the complete decay of the daughters. Describes a rapid field method for determining atmospheric concentrations of radon daughters in terms of Mev of alpha energy/liter. No attempt has been made to set a maximum allowable concentration for radon and/or its daughters. Should an M.A.C.

Reports daily run-of-wind measurements, made for 3 years at distances of 3.5 h and 7 h to leeward of a 7-row shelterbelt about 6m.high. After elimination of variations in wind direction, the monthly values of relative shelter at these positions showed no evidence of an increase with time. The variations in wind direction were eliminated by regressions of monthly values of relative shelter on the monthly percentage frequency of effective winds, i.e. winds from the normal windward side of the shelterbelt.

Gives details of a method for determining the amount of radon emanating from a carbonate rock specimen. Analysis was first made with rock in solid form. An essay was then made with the material containing radium in a clear acid solution.< Discusses the need for the analysis of building material causing any type of abnormally high background variation. Outlines laws covering the buildup and decay of radon.

Reports study to investigate the possibilities of purifying air from formaldehyde by using a filter that brings the air into contact with an adsorbent substance. Finds that the type of adsorbent substance that works satisfactorily is that which involves adsorption in combination with the oxidation breakdown of adsorbent substances. Compares costs for residential premises between a) an increase in ventilation and the use of a heat exchanger and b) the type of air purification and recirculation describes above.

Discusses heat losses from buildings. Calculates proportion of heat loss due to ventilation under simplifying assumptions. Discusses factors influencing air change rates. Calculates energy that could be saved in the republic of Germany by reduction of ventilation under three different assumptions of energy price increases.

Ventilation is a key factor in low energy housing and in temperate maritime climates such as Britain's moisture is a major factor in determining ventilation needs. Outlines necessary levels of humidity for both people and buildings. Summarises sources of moisture. Discusses control of humidity by either mechanical ventilation or heat pump dehumidification.

Reports investigation whose object was to devise a quick and simple method for checking the airtightness of a whole building. Describes pressurization of building and gives results from 20 single family houses and five multifamily buildings. Finds that the majority of the multifamily buildings investigated conform to requirements in the regulations and about one half of single family houses satisfy the requirements stipulated for the transitional period.

Describes a computer technique for analysing air movement resulting from stack effect in a tall building. Describes the method which determines the air flows for all possible paths through exterior walls and within the building. The building is divided into multi-storey zones based on the design of the building and the HVAC system. Gives an example of the method applied to a building under two different climatic conditions. Considers the problem of thedifficulty in opening doors due to excess pressure across the door.

Briefly describes instrumentation and techniques for measuring concentrations of radon daughters in air. Reports measurements of radon daughter levels made in nine structures in Grand Junction, Colorado. Tailings from uranium mines had been used in their construction and measurements were made in the basement or first-floor of slab type structures. Gives results in the form of average concentration with standard deviation.

Reports pressure measurements made on five shapes of glasshouses, under natural wind conditions and generally over a 90 deg. range of direction. Gives pressure coefficients from 48 tapping points for four different glasshouses.