Asphalt and concrete prevent water and air from reaching roots and increase the temperature of the soil and the air around the tree. “Permeable” pavers are slightly better, but soil needs to be compacted for paver installation which damages roots and reduces soil pore space.
*No new paving (concrete, asphalt, pavers, etc.) is permitted within 10 feet of a public tree (PAMC 8.04.020)