BreezoMeter - Health-focused Environmental Intelligence
CPU-Z - CPU-Z is a freeware that gathers information on some of the main devices of your system : Processor name and number, codename, process, package, cache levels.
World Air Quality Index - Air quality index for the globe
Speccy - Speccy - find the details of your computer's specs. Great for spotting issues or finding compatible upgrades. Download the latest version free.
Flow by Plume Labs - The smart air quality tracker to help you find clean air
AIDA64 - AIDA64 is a system information, diagnostics and benchmarking solution for Windows PC.