The two one-week samples were taken during winter in São Paulo, when the highest pollution is expected due to thermal inversion that frequently occurs during this season.
People with lung and heart problems in areas with high pollution have been advised to avoid exercise, until it passes on Friday.
This week, as dust from the Sahara has been making the capital's poor air quality even worse, BBC London reports London Mayor Boris Johnson's plans to stop people driving during high pollution have been dropped.
Similarly, standards that focus on avoiding a few high pollution days are unlikely to be very effective in improving overall public health.
Very high levels of pollution are also forecast later on Thursday for the east midlands.
The high levels of pollution are an embarrassment to the Communist regime.
High levels of pollution are marked in shades of red from 7 to 9 on the scale.
As can be seen, despite some exceptions, countries with higher levels of pollution are also those that have lower levels of rule of law.
Conclusions: Even in an affluent region in Western Europe, where infant mortality is low, days with higher PM air pollution are associated with an increased risk of infant mortality.
Instead they suggest that higher levels of pollution are generally more harmful, with the RRs appearing relatively robust to the components of the mixture.
