Awareness, isn’t that what it’s all about? Had we been “aware” of toxic water and rain runoff polluting our waterways decades ago maybe a permeable concrete would have been available to developers and builders. Luckily, during this decade, more are becoming aware and will modify on-going routines like sealing driveways.
Coal-tar has been determined by a recent US Geological Survey to be the number one pollutant of urban lakes! Some States have banned the use of coal-tar for sealing asphalt, hopefully more will follow. Coal-tar has been linked to some lung diseases, cancers and can even affect reproductive health.
Read about some alternatives to coal-tar, look at the US Geological survey and see for yourself what polcyclic aromatic hydrocarbons (PAHs) are doing to your health and the environment.