I'm building an outdoor weather station. I'm having trouble finding suitable sensors for measuring the levels of various pollutants (except particulates; I found a suitable sensor). Everything I can find measures in the 100ppb range, but I need to sense these in the 10ppb range for them to be useful (I believe).

Specifically, I am looking for sensors for ozone, carbon monoxide, sulphur dioxide, and nitrogen dioxide. Even better if I can find something that handles all of them.

Alternatively, according to the NWS: "Ground-level ozone and airborne particles are the two pollutants that pose the greatest threat to human health in this country." So maybe all I need is a good ozone sensor?

Advice welcome!