Mexico City’s Ozone Levels Break Records

Ozone approached dangerous levels in Mexico City’s air over the weekend and broke seasonal records, but health officials failed to issue any smog alerts, the government newspaper El Nacional said.

More than 10,000 people suffered serious respiratory problems because of the smog, the Excelsior news service said.

Ozone levels in the southern part of the city hit 297 points on the government scale, or 687 micrograms per cubic meter of air, on both Saturday and Sunday. Mexico’s official index lists anything over 300 as “dangerous,” over 200 as “very poor” and over 100 as “poor.”