1. The chart below shows some pollution indexes for some of the world's countries. Answer the questions Show your calculations. (See page 432)

2020 World Air Quality Report
Country	PM2.5
New Caledonia	3.7
Estonia	5.9
Australia	7.6
Belgium	8.9
Denmark	9.4
Spain	10.4
Latvia	11.3
Philippines	12.8
Hungary	14.3
Hong Kong SAR	15.4
Albania	16.0
Peru	17.9
Mexico	18.9
Kosovo	20.0
Croatia	21.2
Laos	22.4
Montenegro	26.1
United Arab Emirates	29.2
Kuwait	34.0
Bosnia Herzegovina	40.6
Afghanistan	46.5
https://www.iqair.com/us/world-most-polluted-countries

1. Which country was in the 70-percentile position?

1. What was the percentile for Belgium?

1. How many countries were the best 20% for air quality (smallest PM2.5)?

1. Of the countries in the list, name the countries that are in the 10% which pollute the least.