air quality?

Question

how to measure PM10? wat is Air Pollution Index?

Answer 1

Here's a detailed explanation of how to measure air quality index.

http://www.adeq.state.ar.us/techsvs/dailyaqidata.asp#AQI

Here's the official EPA link.
http://airnow.gov/index.cfm?action=aqibroch.index

PM10 is particulate matter. Here's more info.
http://www.epa.gov/wtc/pm10/pm_fact_sheet.html