Best Of

then removed 30 years later when they repave the road

the intersection that got a light after some of the neighbor kids were killed in an accident when i was basically too young to understand what happened got removed 10 years or so ago.

below is an excerpt from a medical journal article citing epidemiological studies looking for elevated problems on a population basis for long term low level exposure.

to summarize, they noted some elevation, but the signal is sort of clouded when you adjust for other airborn polutants such as pm 10, pm 2.5, (fine particulate matter that crosses into the blood in the lungs) and oxides of nitrogen.

In the case of CO from poor venting with hvac equipment those other pollutants are likely to be spilling in addition to CO….

https://www.ncbi.nlm.nih.gov/books/NBK153687/

“Several multi-city studies have found significant associations between increasing short-term average ambient air carbon monoxide concentration and increasing mortality risk when carbon monoxide is considered in single-pollutant models, with the associations attenuated when models were adjusted for other co-pollutants. A time-series study examined mortality in 82 U.S. cities during the period 1987–1994 (Dominici et al. 2003b; HEI 2005; Samet et al. 2000). In the Dominici et al. (2003b) analysis of these data, a 1 ppmincrease in ambient air carbon monoxide concentration (lag 1 day) was associated with increased mortality (from all causes) of 0.46% (95% CI: 0.18, 0.73). Mortality risk was not significant after adjustment for air concentration of PM

10

 alone or for PM

10

 and NO

2

. A time-series study examined morality in 12 Canadian cities during the period 1987–1994 (Burnett et al. 2004). Mortality risk (all non-accidental causes) was significantly associated with ambient air carbon monoxide concentration (lag 1 day) in single-pollutant models, with an increase of 0.68% (t=3.12) per 1.02 ppm increases in air carbon monoxide concentration. However, the association did not persist when adjusted for NO

2

 (0.07%, t=0.30). A time-series analysis examined mortality in 19 European cities during the period 1990–1997 (Samoli et al. 2007). This study found a significant association between carbon monoxide and total non-accidental and cardiovascular mortality in single-pollutant models. The estimated effect size varied depending on the model applied. The effect size for total mortality based on a single-pollutant model ranged from 0.59% increase (95% CI: 0.41, 1.79) to 1.20% (95% CI: 0.63, 1.77) per 1 mg/m

3

 increase in carbon monoxide concentration (0–1-day lag). The effect on cardiovascular mortality ranged from 0.8% increase (95% CI: 0.53, 1.07) to 1.25 (95% CI: 0.30, 2.21). Inclusion of black smoke or NO

2

 in the models substantially decreased the estimated risk attributable to carbon monoxide, with the effect sizes no longer significant in some models.”

i thought that had more to do with nitrous oxides than CO? and apparently a high number of dwellings where methane was just leaking out somewhere.

I would have to take a measurement, but it really wouldn’t have to get vented that far. Probably like 13 or 14 feet worst case scenario, I just ripped the brick chimney down and get a sleeve for a roof extrusion.