INAA of aerosol samples in Mexico City

Total solid particles (TSP), respirable particles (RP) PM10 and 17 metallic pollutants were measured in dwellings in the Metropolitan Zone of Mexico V alley (MZMV) by gravimetry and instrumental neutron activation analysis (IN AA). Monitoring was performed in Northeast, Center, Southeast and Southwest Zones in the winter and spring seasons. In general, the average concentrat ion of contaminants (derived from industrial activities) that we have deter mined have increased with time. TSP and RP PM10 are often above the US and Mexican norms.