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These often include: Some volatile organic compounds (VOCs) Some carbonyl compounds (a group of chemicals that includes irritating aldehydes) Research shows that when more charcoal is added to a filter, reductions in certain carbonyl compounds often increase

Nonsmokers who have high blood pressure or high blood cholesterol have an even greater risk of developing heart diseases when theyre exposed to secondhand smoke

10.1001/jama.2013.284692 Acknowledgments We thank the BRFSS coordinators for their assistance in providing the data

Our county-level estimates provide a means of assessing and tracking the impact of such efforts

Less dramatic than surface treatment, but it helps