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Illinois, DuPage

Air Quality Alert

Statement as of 3:21 PM CDT on September 23, 2017

Expires 1:00 AM EDT on September 24, 2017


... Air quality alert in effect until midnight CDT Sunday night...

The Illinois environmental protection agency has determined that an
air pollution action day will be declared for the greater Chicago
metropolitan area through midnight CDT Sunday night... September
24th for the following counties...

Cook... dupage... Kane... Kendall... Grundy... lake... McHenry and will.

An air pollution action day is declared when weather conditions are
such that widespread ozone and or particulate levels are expected to
be at or above the unhealthy for sensitive groups category of the
air quality index.

Active children and adults especially people with pulmonary or
respiratory disease such as asthma should limit prolonged outdoor
activity.

Area residents are urged to reduce pollution levels. Air quality
forecasts and tips on how you can reduce your emissions can be found
at www.Airnow.Gov.

Media contact... 217 558 1536.



321 PM CDT Sat Sep 23 2017

... Air quality alert in effect until midnight CDT Sunday night...

The Illinois environmental protection agency has determined that an
air pollution action day will be declared for the greater Chicago
metropolitan area through midnight CDT Sunday night... September
24th for the following counties...

Cook... dupage... Kane... Kendall... Grundy... lake... McHenry and will.

An air pollution action day is declared when weather conditions are
such that widespread ozone and or particulate levels are expected to
be at or above the unhealthy for sensitive groups category of the
air quality index.

Active children and adults especially people with pulmonary or
respiratory disease such as asthma should limit prolonged outdoor
activity.

Area residents are urged to reduce pollution levels. Air quality
forecasts and tips on how you can reduce your emissions can be found
at www.Airnow.Gov.

Media contact... 217 558 1536.


1206 am CDT Sat Sep 23 2017

... Air quality alert in effect until midnight CDT tonight...

The Illinois environmental protection agency has determined that an
air pollution action day will be declared for the greater Chicago
metropolitan area and is in effect until midnight CDT tonight.

An air pollution action day is declared when weather conditions are
such that widespread ozone and or particulate levels are expected to
be at or above the unhealthy for sensitive groups category of the
air quality index.

Active children and adults especially people with pulmonary or
respiratory disease such as asthma should limit prolonged outdoor
activity.

Area residents are urged to reduce pollution levels. Air quality
forecasts and tips on how you can reduce your emissions can be found
at www.Airnow.Gov.

Media contact... 217 558 1536.


1206 am CDT Sat Sep 23 2017

... Air quality alert in effect until midnight CDT tonight...

The Illinois environmental protection agency has determined that an
air pollution action day will be declared for the greater Chicago
metropolitan area and is in effect until midnight CDT tonight.

An air pollution action day is declared when weather conditions are
such that widespread ozone and or particulate levels are expected to
be at or above the unhealthy for sensitive groups category of the
air quality index.

Active children and adults especially people with pulmonary or
respiratory disease such as asthma should limit prolonged outdoor
activity.

Area residents are urged to reduce pollution levels. Air quality
forecasts and tips on how you can reduce your emissions can be found
at www.Airnow.Gov.

Media contact... 217 558 1536.



1143 am CDT Fri Sep 22 2017

... Air quality alert in effect for Saturday September 23rd...

The Illinois environmental protection agency has determined that an
air pollution action day will be declared for Saturday September 23rd
for the greater Chicago metropolitan area including the counties
of...

Cook... dupage... Kane... Kendall... Grundy... lake... McHenry and will.

An air pollution action day is declared when weather conditions are
such that widespread ozone and or particulate levels are expected to
be at or above the unhealthy for sensitive groups category of the air
quality index.

Active children and adults and especially people with pulmonary or
respiratory disease such as asthma should limit prolonged outdoor
activity.

Area residents are urged to reduce pollution levels. Air quality
forecasts and tips on how you can reduce your emissions can be found
at www.Airnow.Gov.

Media contact... 217 558 1536.


1143 am CDT Fri Sep 22 2017

... Air quality alert in effect for Saturday September 23rd...

The Illinois environmental protection agency has determined that an
air pollution action day will be declared for Saturday September 23rd
for the greater Chicago metropolitan area including the counties
of...

Cook... dupage... Kane... Kendall... Grundy... lake... McHenry and will.

An air pollution action day is declared when weather conditions are
such that widespread ozone and or particulate levels are expected to
be at or above the unhealthy for sensitive groups category of the air
quality index.

Active children and adults and especially people with pulmonary or
respiratory disease such as asthma should limit prolonged outdoor
activity.

Area residents are urged to reduce pollution levels. Air quality
forecasts and tips on how you can reduce your emissions can be found
at www.Airnow.Gov.

Media contact... 217 558 1536.



Public Information Statement

Statement as of 10:42 PM EDT on September 23, 2017

Expires 10:45 AM EDT on September 24, 2017


... Record late season heat numbers...

Late September 2017 is seeing near to record warmth across a
sizable portion of the Midwest, including northern Illinois and
Northwest Indiana. Following are climatological numbers to put
this ongoing late season heat into perspective.

**************************************************************
Chicago

Records date back to 1871.

Date 2017 high record high 2017 low record warm minimum
--------------------------------------------------------------
9/20 92* 91 (1931) 62 73 (1931)
9/21 94* 92 (1970) 72 76 (1931)
9/22 94* 92 (1956) 71 73 (1895)
9/23 95* 91 (1937) 72* 71 (1891)
9/24 91 (1891) 71 (1930)
9/25 90 (1933) 76 (1931)

* = record

2017 has seen the latest 90+ since 2007 (sept 24).

Latest 90+ degree reading on record: Oct 6, 1963 (94)
latest 95+ degree reading on record: sept 29, 1953 (99)

There has never been a heat wave of this duration and magnitude
this late in the season in Chicago. Chicago has never recorded
4 consecutive days with high temperatures 92f+ this late in the
year. The previous latest streak of 4+ days in a row of 92f+
was sept 16-19, 1955.

In addition, this is the latest Chicago has ever recorded 3 days
in a row of mid 90s (94f+). The previous record for latest 3+ day
streak of mid 90s was back on sept 13-15, 1927 and also the same
dates in 1939.

Saturday's high temperature of 95f tied for the hottest day of
2017. This sets a record for the latest in the year that the
hottest temperature of the year was recorded in Chicago.
Previously, the latest in the year that the annual high
temperature occurred was sept 14th back in 1893, 1915, and
also 1927.

The daily average temperature on sept 21 was 83 degrees, which
ties for the warmest daily temperature on record after the
midpoint of sept (sept 21, 1931).


**************************************************************
Rockford

Records date back to 1905.

Date 2017 high record high 2017 low record warm minimum
--------------------------------------------------------------
9/20 91 92 (1920) 63 74 (1895)
9/21 89 94 (1920) 69 70 (1895)
9/22 92 93 (1937) 67* 65 (1959)
9/23 93* 92 (1937) 66^ 66 (1920)
9/24 92 (1920) 70 (1930)
9/25 95 (1920) 69 (1972)

* = record
^ = record tied

2017 has seen the latest 90+ since 2010 (oct 9).

Latest 90+ degree reading on record: Oct 9, 2010 (90)
latest 95+ degree reading on record: sept 25, 1920 (95)

Latest stretches of 2+ consecutive days of 90+:
1. Oct 2-5, 1922
2. Sept 30-Oct 1, 1971
3. Sept 24-26, 1920
4. Sept 22-23, 1937

The latest in the year that the annual high temperature
occurred: sept 15, 1927 (99)

The highest temperature in 2017 has been 94 on June 11 and 12.

For more, please see weather.Gov/Chicago and click on climate
and past weather.


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Wisconsin - Air Quality Alert , Record Report
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