change description

added comments

Added text representation of polution levels

Create eur_aqi_matlab.m

Update and rename matlab_caqi.m to usa_matlab_caqi.m

Update matlab_caqi.m

convert pm2.5 to CAQI

Delete matlab_caqi.txt

Create matlab_caqi.m

Create matlab_caqi.txt

Update dust_wifi.ino

changed pm2.5 calcualtions

Update dust_wifi.ino

Update README.md

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