The COVID-19 pandemic appears to have changed air quality in Canada for the better. In our most populated cities, research shows stay-at-home orders and travel restrictions have resulted in significantly lower levels of fossil fuel consumption, vehicle emissions and greenhouse gases than were seen in recent years before the pandemic. The decrease in travel across Canada and worldwide has also reduced pressure on sensitive tourist sites. In our lakes, rivers, ponds and streams, though, a different story is unfolding.