Air pollutant concentrations

About: Air pollutant concentrations is a research topic. Over the lifetime, 1652 publications have been published within this topic receiving 36138 citations.

Cold-front activities and itsinfluence on air pollution aturban districts of lanzhouin cold half year

Abstract: It has been analysed that the data of 500hPa historical synoptic maps and the data of air pollutant concentrations were monitored by automatic monitoring system in Environmental Monitoring Station of Lanzhou in the period of 1988～1991 The analysed results are as follows:under the control of two-trough and one-ridge synoptic circulation pattern the frequency of cold-front activities at Lanzhou is the highest with 548% It is higher with 355% under the control of one -ridge and one-trough synoptic circulation pattern In cold half year the activest stages of the strongest and stronger cold fronts are in March The other activer stages of cold fronts are in October The activest stages of weak cold fronts is in January Influence of cold-front passage on SO2 concentrations at Lanzhou is the most remarkable The average decreasing rate of SO2 concentration is about 30% to 50% and the maximum decreasing rate is about 70% to 80% The decreasing rate of NOx concentration is also more remarkableIn the process of cold front weather, the correlation between inversion depth and air pollutant concentration is the most remarkable The correlations between temperature, mixing depth and air pollutant concentrations respectively are reducing in proper order Influences of above mentioned three meteorological factors on the changes of air pollutant concentrations are different in the processes of the strongest, stronger and weak cold front weather

Air pollution indices for Victoria

Abstract: A computer implementation of an integrated empirical rate model of urban air pollution reacdons has been used to monitor the concentrations of various air pollutants in air parcels traversing the Melbourne air shed. It shows that the levels of highly oxidised photochemical smog products may place more days into the unacceptable air pollution band than has been recent practice. It is also argued that the use of a uniform air quality index that individually indicates the levels of a wide range of pollutants on a standardised scale should be adopted.

Technology and Costing of Air Pollution Abatement

Abstract: Publisher Summary This chapter presents the basic approaches to abatement of air pollution. In selecting an abatement system, one must consider the air pollutant emissions, the gas stream containing the emissions, and the required goal in emission reduction. In characterizing the emissions, its gas stream, and the requirements for removal, the first step is to develop enough background information to evaluate alternative abatement systems and to compute the cost and other impacts of these systems. With this background information, the engineer can evaluate the various abatement systems, select the appropriate system, and design the system in detail. The nature of the pollutants and the gas stream containing the pollutants is key to the design and effectiveness of the abatement system. Air pollutants can be generated and emitted in one of three physical states: gaseous, liquid, or solid. Gaseous air pollutants can be reduced through chemical reactions such as combustion or through physical means such as condensation. In general, emissions of solid air pollutants are reduced through physical means such as impaction or filtration. Liquid air pollutants can be treated as solid air pollutants, but also may be heated to change the liquid to a gas for abatement as a gas.

Association of fine-particulate and acidic-gas air pollution with premenstrual syndrome risk.

Abstract: Objective Air pollution had been reported to be associated with the reproductive health of women. However, the association of particulate matter (PM) and acid gases air pollution with premenstrual syndrome (PMS) warrants investigation. This study investigated the effects of air pollution on PMS risk. Population We combined data from the Taiwan Air Quality-Monitoring Database and the Longitudinal Health Insurance Database. In total, an observational cohort of 85 078 Taiwanese women not diagnosed as having PMS. Methods Air pollutant concentrations were grouped into four levels based on the concentration quartiles of several types of air pollutants. Main outcome measures We then applied univariable and multivariable Cox proportional hazard regression models to assess PMS risk in association with each pollutant type. Results Women exposed to Q4-level SO2 exhibited a 7.77 times higher PMS risk compared with those to Q1-level SO2 (95% confidence interval [CI] = 6.22-9.71). Women exposed to Q4-level NOx exhibited a 2.86 times higher PMS risk compared with those exposed to Q1-level NOx (95% CI = 2.39-3.43). Women exposed to Q4-level NO exhibited a 3.17 times higher PMS risk compared with women exposed to Q1-level NO (95% CI = 2.68-3.75). Finally, women exposed to Q4-level PM with a ≤2.5-µm diameter (PM2.5) exhibited a 3.41 times higher PMS risk compared with those exposed to Q1-level PM2.5 (95% CI = 2.88-4.04). Conclusions High incidences of PMS were noted in women who lived in areas with higher concentrations of SO2, NOx, NO, NO2 and PM2.5.

The magnitude and relative environmental impact of air pollutant emissions from aerosol industry products

Abstract: Aerosol industry products have in the past been a major source of CFC emissions. This situation has changed very rapidly and in developed countries CFC use has been eliminated other than in a few essential medical products. Current and likely future air pollutant emissions from aerosol industry products are evaluated in terms of their stratospheric ozone depletion potential, global wanning potential and photochemical ozone creation potential. Environmental impacts of future emissions are likely to be minimal in comparison to those from other air pollution sources.