one of the major environmental problems in large cities is air pollution. in this study, the monthly and annual changes in the average concentrations of carbon monoxide and pm10 were investigated during a five-year period (winter and fall of 1383-1387 a.h.s) in tehran. the effects of meteorological parameters on these parameters were also investigated. the study area was divided into three zone...

INTRODUCTION . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . .. . . . . . . . .... . . ... . . . . . . . . . . . . . . ... . . . .. . . . . . . . . . 277 CONSONANCE . . . . . . . . . . . . . . . . .. . . . . . . . . ....... . . . . ... . . . . . . . . . . . . . . . . . . . . . . .... . . . . . . . . . . .. . . . . . . .. . 278 TUNING AND INTONATION...... . . ........ . .....

BACKGROUND The elevation and dissipation of pollutants after the ignition of fireworks in different functional areas of a valley city were investigated. METHODS The Air Quality Index (AQI) as well as inter-day and intra-day concentrations of various air pollutants (PM10, PM2.5, SO2, NO2, CO, O3) were measured during two episodes that took place during Chinese New Year festivities. RESULTS F...

BACKGROUND AND OBJECTIVE Newborn pulse oximetry screening is recommended to promote early referral of neonates with critical congenital heart disease (CCHD) and reduce mortality; however, the impact of late referral on mortality is not well defined. The purpose of this population-based study was to describe the association between timing of referral to a cardiac center and mortality in 2360 liv...

Fine airborne respirable particulates less than 10 micrometer (PM10) are considered one of the top environmental public health concerns, since they contain polycyclic aromatic hydrocarbons (PAHs) which are among the major carcinogenic compounds found in urban air. The objective of this study is to assess the genotoxicity of the ambient PM10 collected at 11 urban sites in Jeddah, Saudi Arabia. T...

Surface coal mining creates more air pollution problems with respect to dust than underground mining . An investigation was conducted to evaluate the characteristics of the airborne dust created by surface coal mining in the Jharia Coalfield. Work zone air quality monitoring was conducted at six locations, and ambient air quality monitoring was conducted at five locations, for a period of 1 yea...

The Brazilian Institute of Radiation Protection and Dosimetry (IRD/CNEN) carried out quality assurance regulatory audits in Brazilian radiotherapy facilities from 1995 to 2007. In this work, the set of data collected from 195 radiotherapy facilities that use high-energy photon beams are analyzed. They include results from audits in linear electron accelerators and/or Co-60 units. The inspectors...

This study aims to classify regions with different air pollution characteristics into groups in Taiwan, and further to evaluate and compare the air quality of various groups. A selected multivariate analysis technique, cluster analysis, is applied to the pollution monitoring dataset which including PM10, SO2, NO2, CO and O3. The obtained results have proved that the regions with similar air pol...

The widespread and rapid social economic changes from Covid-19 response might be expected to dramatically improve air quality. However, national monitoring data the US Environmental Protection Agency for criteria pollutants (PM2.5, ozone, NO2, CO, PM10) provide inconsistent support that expectation. Specifically, during stay-at-home orders, average PM2.5 levels were slightly higher (~10% of its...

objective: there are many communities at risk by a series of air pollution episodes. tehran is one of the most polluted cities in the world. the presence of one or more air pollutants with a certain concentration in a particular period of time can cause several adverse effects on human and animals’ well-being that can cause much morbidity. there are several pollutants in the air but some of the...