Air pollution is a problem that no major city in the world has avoided. Air pollution from industry, from the large numbers of homes clustered together in and around the cities and the widespread use of motor vehicles means that the quality of the air in cities suffers. Although the most obvious large emissions from factory chimneys have been eliminated – there are still lots of smaller amounts of polluting emissions from a broad range of large and small industries which contribute to Melbourne’s air pollution.In Melbourne and other Victorian cities and towns, we are lucky. Air quality is good most of the time, thanks to low population density, favourable climate and tight regulations (see graphs below). The main air pollutants of concern for Victoria are ozone (in summer) and very small particles (mostly in winter) that we can breathe in. Unlike many of the developed countries in the world, acid rain is not a problem for us.
When the air quality is relatively bad with many fine particles suspended in the atmosphere, one thing that occurs is a range of colourful sunsets because of the light diffraction.
This post is part of the Skywatch Friday meme.