Abstract— In the last few decades, indoor air problems have increased in Swedish housing, office and school buildings. The problems that are mentioned are mucosal and respiratory symptoms, asthma, skin symptoms, fatigue and headache. In the environmental health report compiled by the responsible authorities, it is shown that the scope of the problem has been constant since the early 1990s. This is done despite the fact that extensive efforts have been made and extensive resources have been used in research, government investigations with new industry directives and through measures taken in buildings. There is a great need for validated analysis and measurement methods, as well as finding level values for the air environment in Swedish housing, office and school buildings. The purpose of this project is to evaluate whether outdoor air can be used as an indicator and level sensor for the quality of the indoor air environment. Outdoor air is an indicator where the number of particles, preferably those larger than 5.0 μm, is a valuable parameter. The long-term goal should be to build a bank with values from the outdoor air. This bank should include values with an even distribution that include temporal variations, the Swedish seasonal variations and the longer-term variations that occur annually. In addition, it should cover a uniform distribution across the whole of Sweden. This bank should be a better basis for assessing the environment in each object, instead of using the value of the level outside the building at the current time of measurement. An important issue is the calibration of measuring instruments to make the results comparable. In this project, this is not a problem since only one and the same instrument is used, but when using several instruments, the relationships actualized.
Keywords: Air quality, Hygiene and Health, Indoor Environment, Particle Amount, Particle Measurements, Particle Size.
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