Passage Summary: Even if treated wood doesn't smell dangerous outside, we need to test it because kids might put their mouths on it or the chemicals might leak into our food.

Conclusion: Immediate action is required to determine if the chemicals used in treated lumber are safe for consumers.

Reasoning: While fumes may not be a risk outdoors, consumers could still ingest the chemicals through contact with playground equipment or through soil in vegetable gardens.

Analysis: To identify the conclusion, look for the author's main point of advocacy. The editorialist begins with a concession about fumes to dismiss a common counter-argument, then uses the word 'however' to pivot to the main claim. The subsequent sentences about children and gardens serve as evidence to justify why the safety determination is so urgent. The conclusion is the call to action regarding the safety testing of these chemicals.