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Experimental efforts of the last decades have been unsuccessful in detectingWIMPs (Weakly Interacting Massive Particles) in the 10-to-10$^4$ GeV/$c^2$range, thus motivating the search for lighter dark matter. The DAMIC (DArkMatter In CCDs) at SNOLAB experiment aims for direct detection of light darkmatter particles ($m_\chi <$ 10 GeV/$c^2$) by means of CCDs (Charge-CoupledDevices). Fully-depleted 675 $\mu$m-thick CCDs are used to such end. Theoptimized readout noise and operation at cryogenic temperatures allow for adetection threshold of 50 eV$_{\text{ee}}$ electron-equivalent energy. Focusingon nuclear and electronic scattering as potential detection processes, DAMIChas so far set competitive constraints on the detection of low mass WIMPs andhidden-sector particles. In this work, an 11 kg-day exposure dataset isexploited to search for light WIMPs by building the first comprehensiveradioactive background model for CCDs. Different background sources arediscriminated making conjoint use of the spatial distribution and energy ofionization events, thereby constraining the amount of contaminants such astritium from silicon cosmogenic activation and surface lead-210 from radonplate-out. Despite a conspicuous, statistically-significant excess of eventsbelow 200 eV$_{\text{ee}}$, this analysis places the strongest exclusion limiton the WIMP-nucleon scattering cross section with a silicon target for 1 GeV $<m_\chi c^2<$ 9 GeV.

Results on Low-Mass Weakly Interacting Massive Particles from a 11 kg d Target Exposure of DAMIC at SNOLAB (ICRC2021 Proceedings)