SmogRank / History / City race
Cities in Peru, worst air first, day by day
Each measured city's average over the 30 days to every day since January 2023, worst first. Find your own city to follow it through the race, or keep to one country.
The worst cities in Peru for PM2.5 over the 30 days to 12 May 2026: Santa Anita - Los Ficus 36.4 µg/m³, San Francisco De Borja 31.7 µg/m³ and Santa María 28.8 µg/m³.
- 1Santa Anita - Los FicusLima region36.4
- 2San Francisco De BorjaLima region31.7
- 3Santa MaríaLima region28.8
- 4LimaLima Province27.5
- 5CallaoCallao25.6
- 6Villa Poeta José Gálvez BarrenecheaLima region14.1
Cities counted each day
A city's number is its average over the 30 days, shown only when 21 of them were measured (5 of 7 on the 7-day race), the same minimum as the 30- and 7-day boards. A city whose monitors go quiet fades out where it stood rather than sliding down, so a gap never reads as cleaner air. Some large countries are thin or missing because their monitors' licences don't allow reuse. How we rank.
Not covered: the government monitoring networks of China and Turkey, which publish only on their own websites; we are building the readers for them. Most cities there are missing from this board, not clean. Why.