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But if you want healthy plants, avoid planters made of copper or galvanized metal because they can leach copper and zinc into the soil.

The authors of the Communications Earth and Environment paper cite, for example, research showing hydrochloric acid emitted from solid rocket launches killing fish after it leached into nearby water.

The protesters say they are concerned that toxic chemicals from the fires could drift into their neighborhoods as airborne dust or leach into the groundwater.

Some said they were afraid that toxic chemicals or other fire debris would leach into the air, soil or water.

The EPA has not responded to the complaints, but agency officials said its crews have installed liners to prevent toxic chemicals from leaching into soil.