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Khan NA, Lawyer G, McDonough S, et al

Regularly removing ashes and cigarette butts from ashtrays will prevent them from continuing to give off a bad odor

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These correlations may reflect better enforcement, management strategies, or local governance linked to protected area networks, suggesting geography serves as a proxy variable for contaminant burden in protected areas, which appears to be more systematically influenced by geographic factors and potentially more responsive to protective policies compared to unprotected areas [4]

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