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Some common interference gases for CO sensors include: Hydrogen (H2): Hydrogen gas can cause a false positive reading on some CO sensors, particularly those using electrochemical technology

But the light turns blue for excellent, green for good, yellow for moderate, orange for polluted, and red for very polluted air

economy was about one-fourth larger in 1983 than it had been in 1973

Epidemiology of lung cancer: looking to the future

(These estimates do not include revenue from the one-time tax on cigarettes stored by wholesalers and dealers.) The cigarette excise tax increase would generate somewhat lower amounts of revenue each year thereafter, based on our projections of continued declines in cigarette consumption

It includes a fragrance blend based on orange and rosemary that enhances the aroma of the smoke, making it more pleasant for people