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Illinois, Cook

Air Quality Alert

Statement as of 12:06 AM CDT on September 23, 2017

Expires 1:00 AM EDT on September 24, 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 2:58 AM EDT on September 23, 2017

Expires 8:00 PM EDT on September 23, 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 91 (1937) 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)

This has been the second latest stretch of three or more
consecutive 90+ days:

1. Sept 30-Oct 2, 1971
2. Sept 20-22, 2017
   sept 19-22, 1895

The latest in the year that the annual high temperature
occurred: sept 14 in 1893, 1915, and 1927.

The highest temperature in 2017 has been 95 on June 12.

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 92 (1937) 66 (1920)
9/24 92 (1920) 70 (1930)
9/25 95 (1920) 69 (1972)

* = record

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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