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However , the existing rule has no VOC emission or concentration limitation and very small degreasers or solvents with very low VOC concentrations are exempted from the rule . Because of rising costs , innovators often concentrate their efforts on products with potentially high market return . The next step is to match these observed cloud systems with nearly simultaneous atmospheric state data from the European Center for Medium-range Weather Forecasts ( ECMWF ) . Such novel materials include biologically inspired self-assembled materials , magnetic materials with highly controllable properties , and even granular materials ( sand ) and porous materials ( rock ) . In designing the new service , Verizon has been careful not to overwhelm viewers with too much scrolling , button-clicking and reading on their screens .