This paper presents particulate matter load at different aerodynamic diameter for two seasons of an urban industrial site in Delhi using portable aerosol spectrometer. The result showed that seasonal average concentration varied from 57 to 457µg m-3 for PM10 in the pre-monsoon and 78 to 900 µg m-3 in post-monsoon season. The fine particles with aerodynamic diameter less than 2.5µm were observed from 15 to 65 µg m-3 in pre monsoon and 16 to 772 µg m-3 in post monsoon. The mean concentration variation shows an expected weekly pattern of increased values on weekdays than weekend for pre-monsoon but in post monsoon the weekend concentration was found to be higher than weekday’s value. The mass fraction of PM10-2.5 shows greater variability in post monsoon season with 105µg m-3 and 81µg m-3 for pre-monsoon season. The size ratio fraction for PM2.5/PM10 ranged from 0.17 to 0.66 in two seasons. The seasonal variation for PM10 and PM2.5 showed a strong linear relationship for the weekly behavior with R2 from 0.48 to 0.99. The correlation matrix for weekday and weekend pattern shows that particulate matter of different aerodynamic diameter was positively correlated in two different seasons. The observation indicates that despite several measures of pollution abatement the people living in nearby areas are at significant risk of respiratory health problems.