Pollen Count Chrome Extension - Quick and light pollen checker for your local area. Simply enter your postcode, zip code or town/ city name and it will list pollen counts for up to 15 different plants from trees to grasses and weeds.
Flow by Plume Labs - The smart air quality tracker to help you find clean air
World Air Quality Index - Air quality index for the globe
AirVisual - Air quality information you can trust
uHoo - The most advanced indoor air toxin sensor
Climate Finder - Pick temperature and air quality and find places that match