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What to know about the dangers of wildfire smoke and particulate matter ABC News Breathing in Delhi = Smoking 10+ Cigarettes Day Here's what NO ONE tells you Delhi's PM2.5 levels are 1520 above safe limits. These particles enter deep into RTN: Toronto's wildfire smoke has become so intense that current air quality is being estimated as the equivalent of smoking about 0.125 cigarettes per hour or roughly one cigarette every 8 Measuring PM2.5 concentrations from secondhand tobacco vs. marijuana smoke in 9 rooms of a detached 2 story house ScienceDirect

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