From omfitnessclub.com
AsiaBeijing: 61 Moderate
Hanoi: 203 Very unhealthy
New Delhi Punjabi Bagh: 152 Very unhealthy
Keelung: 53 Moderate
Tokyo Sinjuku: 38 Good
Australia
Melbourne Brighton: 21 Good
Sydney East Randwick: 22 Good
Europe
Amsterdam Hemkade: 10 Good
Bern Bollwerk: 8 Good
Birmingham: 38 GoodLondon Etham: 5 Good
Oslo Alnabru: 7 Good
Paris Center: 58 Moderate
Middle East
Kfar Masaryk, North, Israel: 24 Good
North America
Barrie, Ontario: 21 Good
Los Angeles Reseda: 57 Moderate
New York White Plains: 26 Good
Washington DC Division Street: 59 Moderate
South America
Lima San Borja: 44 Good
Mexico City Hospital General de Mexico: 37 Good
Puente Alto Chile: 80 Moderate
Sao Paulo Americana: 37 Good
So where is it very polluted? If you go to the map (unfortunately it only shows Asia), you can see that China has a lot of red flags as does Dehli in India. With rates over 151 and even as high as 356 (anything over 301 is hazardous), it looks like Peru really isn't that bad. If you do decide to head over to Peru, or are already there, you should try to learn Spanish. The two programmes I recommend are Synergy Spanish and Speak From Day 1. Be happy that not all days are hazy in Peru like they are in Linfen, China.