Study On Cigarette Combustion Emission Characteristics And Its Effect On Indoor Air Quality

Environmental Tobacco Smoke (ETS) is one of the main pollution sources which affect Indoor Air Quality (IAQ). There are various cigarette combustion emission detriments to human body including the stimulation on eyes, nose and throat. Meanwhile, the large amounts of carcinogenic materials contained in ETS will significantly increase the chances of suffering from lung cancer and heart diseases of the non-smokers. Thus, exposure to ETS will lead to severe health threat. Besides, particles released from burning cigarettes is the main source of indoor particles. PM2.5, also referred to as fine particulate matter, has received high attention due to its effects on air quality and environmental pollution. How to effectively quantify the influence induced by indoor pollution source and how to ensure healthy indoor environment have become the most concerned problems.Both ETS and IAQ has been studied for decades, while the relevant studies were mainly concentrated on the determination of smoke chemical components and the combustion pyrolysis characteristics. Few people had conducted comprehensive researches into the cigarette combustion emission generation and migration characteristics. There also lacks the corresponding evaluation model or assessment method of the cigarette combustion emission effects on indoor air quality. Therefore, it is necessary to conduct study on cigarette combustion emission characteristics and its effect on indoor air quality. This paper utilised the methodology of experimental monitoring and theoretical analyse to conduct researches including cigarette combustion emission characteristics, the emission products migration within building and their effects on indoor air. The research contents include cigarette combustion emission Thermogravimetry Infrared Spectrometry (TG-IR) test, studies on migration characteristics of nano and micron scale particles, detailed indoor air quality assessment using fuzzy inference system and the impact assessment of cigarette emissions on indoor air quality.Cigarette combustion emission TG-IR test was firstly conducted to study the cigarette pyrolysis products generation characteristics. The test revealed the quantitative relation between external pyrolysis temperature and cigarette combustion emission products yield including aromatic ring compounds and hydrocarbons etc. The cigarette combustion emission migration characteristics study utilised online monitoring instruments DMS500spectrometer and LD-5rapid light scattering dust measuring instrument to detect the particles of different aerodynamic diameters. The monitoring experiments considered the single and dual cigarette sources conditions for the first time. The experimental measurement results verified that PM concentration indoor varied significantly in different spatial locations and time intervals with different cigarette amounts.Next, based on the particle monitoring experiment results and fuzzy inference system (FIS) methodology, an indoor air quality assessment model was built to predict the dynamic indoor air particle concentration level. The last part of the paper is the establishment of the impact assessment method of cigarette emissions on indoor air quality. Carbon monoxide (CO), carbon dioxide (CO2), particulate matter (PM), total volatile organic compounds (TVOC), benzene (B[a]P) and polycyclic aromatic hydrocarbons (PAHs) were chosen to conduct comprehensive IAQ impact assessment. The actual monitoring curve of pollutants and related standard value were selected. Besides, toxicity index of different emissions are defined to reflect the harmfulness of specific emission to human body. The detailed hazardous index calculation method is given in the paper. By combining the toxicity index and multi factor evaluation index methodology, the impact assessment of cigarette emissions on indoor air quality is accordingly determined. The assessment methodology provides technical support and reference for future research on cigarette and building environment.