Trump threatens Canada tariffs over wildfire smoke

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- Trump is threatening to raise tariffs on Canada over wildfire smoke that drifted from Canadian fires into the U.S., triggering health warnings and disrupting outdoor activities.
- Canadian wildfire smoke has become a semi-regular occurrence in the Midwest and Northeast, per the source, making the dispute an escalating recurring flashpoint between the two trade partners.
Why it matters: Tariff threats over an environmental issue — rather than a trade or security dispute — raise the stakes of cross-border air-quality events and could entangle U.S.-Canada trade relations in a new, harder-to-resolve dimension.

