Current National Ambient Air Quality Standards (NAAQS) Table
Current National Ambient Air Quality Standards (NAAQS) Table Pollutant [links to historical tables of NAAQS reviews] Primary/Secondary Averaging Time Level Form Carbon Monoxide (CO) primary 8 hours 9 ppm Not to be exceeded more than once per year 1 hour 35 ppm Lead (Pb) primary and Rolling 3 month average 0.15 μg/m3 Not to be exceeded secondary Nitrogen Dioxide (NO2) primary 1 hour 100 ppb 98th ..
Envirometal health
2024. 3. 8. 17:03
