Fresh air in Mexico City, and more

The air pollution in Mexico City was once so bad that birds dropped dead while flying and children used brown crayons to draw pictures of the sky.

Fresh air in Mexico City

The air pollution in Mexico City was once so bad that birds dropped dead while flying and children used brown crayons to draw pictures of the sky. But in recent years, the sprawling metropolis has enacted tough environmental standards, curbed driving, and aggressively promoted mass transit. As a result, its 20 million residents are breathing much easier. Compared with the early 1990s, lead levels in Mexico City are down 95 percent, sulfur dioxide is down 86 percent, and carbon monoxide, 74 percent. “There has been a large improvement,” said Nobel Prize­–winning Mexican chemist Mario Molina, “and it’s important to show it can be done.”

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