الفهرس 
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Abstract
The present work was chiefly designed to evaluate the impact of air pollutants emitted from roadsides, brick and cement factories on the floristic features and diversity of the vegetation growing around these localities. In addition, assess these impacts on the growth, physiological, and anatomical attributes, of some selected plant species growing around sources of pollution including Malva parviflora, Chenopodium murale and Cynanchum acutum species.To achieve the aim of this work the following had been carried out:Studying of 78 stands represented the roadsides, brick and cement factories locations at zero meter, 60 meters and 120 meres from the pollution sources at three governorates (El-Dakahlia, El-Sharkia, and Helwan) to; (i) investigate the floristic features, lifespan, life forms, richness and diversity of the vegetation in the study locations, (ii) Asses the soil characteristics supporting these vegetation as, moisture – texture – porosity – water holding capacity – pH – electrical conductivity – total dissolved salts – chlorides – sulphates - calcium carbonates – organic carbon. Determination of the growth and morphological attributes (shoot length, branches number, root length, leaf length, leaf width, leaf area and dry weight of shoot and root) of the studied plants (Malva parviflora, Chenopodium murale and Cynanchum acutum) at different distances from pollution sources.Estimation of the biochemical aspects as photosynthetic pigments (chlorophyll a, chlorophyll b and carotenoids), total soluble sugars and total carbohydrates in the studied plant at different distances from pollution sources. In addition, the anatomical features of the studied plants were also examined. Assessment of dust amount and heavy metals concentrations in the studied plants and soil.The results of this study revealed the following:The total recorded species in the roadsides were 36 species differentiated 11 perennials, 23 annuals and 2 biennial species. The most represented families were Poaceae, Asteracae, Chenopodiaceae, Fabaceae and Brassiceae. The predominant life forms were therophytes, followed by geophytes, helophytes, hemicryptophytes, chamaephytes and nanophanerphytes. The species that can tolerate pollution and found at zero meter from roadsides were Malva paraviflora, Chenopodium murale, Bassia indica, Phragmites australis, Rumex dentatus, Amaranthus lividus, Cynanchum acutum, Pluchea dioscorides. The Pluri-regional element followed by Bi-regional and Cosmopolitan elements were the most represented floristic elements in the roadside communities. The diversity indices showed that the Simpson (D) index had the highest value at zero meters (polluted sites) from roadsides and the lowest value was at 120 meters (control) from roadside where Shannon (H) index had the reverse trend. The highest species richness was at the control sites and the lowest was at polluted sites.