At the intersection of Rama IV and Sathorn Road...on the southwest corner of Lumpini Park...the people who monitor our air have erected a machine that not only measures what we are breathing but 'broadcasts' the results as well.
It measures:
1) Particulates
2) Carbon monoxide
3) Ozone
4) Sulphur dioxide
5) Nitrogen dioxide
In the five minutes that we sat at the red traffic light the ozone, sulphur dioxide and nitrogen dioxide lights showed 'dashes' (---): meaning either that their sniffers weren't working or that they were telling us that we could inhale their clients to our lungs delight. However, the particulate testing nostril went from --- to 99 to 124 in that same period. Lockstep, time wise, the carbon monoxide readings jumped from 19 to 43 to 86.
To the right of each of these...(to the layman, meaningless)...numbers were rows of lamps. Presumably the one closest to the number indicator was the one our bodies would be happiest with when lit; the one on the far right probably being something akin to America's "Bright-Red, Ultra-Elevated, Got-To-Worry-For-Sure" Homeland Security alert. The particulates fret lamp reached an alarming 75% while we waited for the green light. The others said "Not to worry."